In 1968, LEGO released 34 sets across 3 themes, all of these sets have been retired. For that year, the total price of all retail sets cost $303, today those sets are valued around $23,829.
Most valuable 1968 LEGO set
330-4 Jeep $3,120.63
Largest 1968 LEGO set
118-2 Small Train Set 451 pieces
Most owned 1968 set
336 Fire Engine
1968 moved sets toward a common scale and introduced the first 12V train motor, spoked wheels, and magnetic couplers; the final 1:87 vehicles were sold through.
34 sets

010-3 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 78
Availability Retired
010-3 LEGO Basic Building Set
Retail $2.75
Value $209.81
Growth  +7529.5%
Annual growth 7.8%

011 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 102
Availability Retired
011 LEGO Basic Building Set
Retail $3.25
Value $154.58
Growth  +4656.3%
Annual growth 3.6%

022 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 110
Availability Retired
022 LEGO Basic Building Set
Retail $2.25
Value $97.04
Growth  +4212.9%
Annual growth 14.5%

033-2 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 177
Availability Retired
033-2 LEGO Basic Building Set
Retail $9.50
Value $169.92
Growth  +1688.6%
Annual growth 5.8%

044 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 234
Availability Retired
044 LEGO Basic Building Set
Retail $6.75
Value $201.78
Growth  +2889.3%
Annual growth 6.0%

055-2 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 256
Availability Retired
055-2 LEGO Basic Building Set
Retail $5.75
Value $390.03
Growth  +6683.1%
Annual growth 7.5%

060-3 Jumbo Brick School Set

Theme / Subtheme Samsonite / Jumbo Bricks
Year 1968
Pieces 60
Availability Retired
060-3 LEGO Samsonite Jumbo Brick School Set
Retail $20.00

066 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 407
Availability Retired
066 LEGO Basic Building Set
Retail $11.25
Value $254.18
Growth  +2159.4%
Annual growth 5.5%

66 Governor Set

Theme / Subtheme Samsonite / Basic Set
Year 1968
Pieces 387
Availability Retired
66 LEGO Samsonite Governor Set
Retail $12.95
Value $475.28
Growth  +3570.1%
Annual growth 6.4%

102 4.5V Motor Set

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 24
Availability Retired
102 LEGO Trains 4.5V Motor Set
Retail $14.50
Value $237.72
Growth  +1539.4%
Annual growth 5.2%

113-3 Motorized Train Set

Theme / Subtheme Samsonite / Train
Year 1968
Pieces 402
Availability Retired
113-3 LEGO Samsonite Motorized Train Set
Retail $16.99

116-2 Deluxe Motorized Train Set

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 360
Availability Retired
116-2 LEGO Deluxe Motorized Train Set
Retail $19.99
Value $1,331.29
Growth  +6559.8%
Annual growth 7.5%

118 Electronic Train

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 110
Availability Retired
118 LEGO Electronic Train
Retail $19.95
Value $1,784.58
Growth  +8845.3%
Annual growth 6.9%

118-2 Small Train Set

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 451
Availability Retired
118-2 LEGO Small Train Set
Retail $15.50
Value $1,583.39
Growth  +10115.4%
Annual growth 8.3%

119 Super Train Set

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 436
Availability Retired
119 LEGO Super Train Set
Retail $27.50
Value $1,875.09
Growth  +6718.5%
Annual growth 7.6%

156 2 Signals with Automatic Stop / Go Attachment

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 6
Availability Retired
156 LEGO Trains 2 Signals with Automatic Stop / Go Attachment
Retail $2.75
Value $38.15
Growth  +1287.3%
Annual growth 3.9%

160 Magnetic Couplings

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 6
Availability Retired
160 LEGO Trains Magnetic Couplings
Retail $1.00
Value $18.98
Growth  +1798.0%
Annual growth 6.0%

223 Adventure Set

Theme / Subtheme Samsonite / Basic Set
Year 1968
Pieces 223
Availability Retired
223 LEGO Samsonite Adventure Set
Retail $4.99
Value $310.71
Growth  +6126.7%
Annual growth 7.4%

235-2 Garage Plate and Door Gray Base and Door Frame

Theme / Subtheme Classic / Supplemental
Year 1968
Pieces 5
Availability Retired
235-2 LEGO Garage Plate and Door Gray Base and Door Frame
Retail $1.00
Value $32.85
Growth  +3185.0%
Annual growth 5.2%

236-3 Garage with Automatic Door

Theme / Subtheme Classic / Town Plan
Year 1968
Pieces 59
Availability Retired
236-3 LEGO Garage with Automatic Door
Retail $4.75
Value $900.00
Growth  +18847.4%

244 Explorer Set

Theme / Subtheme Samsonite / Basic Set
Year 1968
Pieces 244
Availability Retired
244 LEGO Samsonite Explorer Set
Retail $4.97
Value $488.50
Growth  +9729.0%
Annual growth 8.2%

326-2 Suburban Set

Theme / Subtheme Samsonite / Basic Set
Year 1968
Pieces 326
Availability Retired
326-2 LEGO Samsonite Suburban Set
Retail $11.50
Value $467.87
Growth  +3968.4%
Annual growth 6.6%

330-3 Jeep

Theme / Subtheme Classic / Vehicle
Year 1968
Pieces 91
Availability Retired
330-3 LEGO Jeep
Retail $3.75
Value $3,103.22
Growth  +82652.5%
Annual growth 12.3%

330-4 Jeep

Theme / Subtheme Samsonite / Model Maker
Year 1968
Pieces 65
Availability Retired
330-4 LEGO Samsonite Model Maker Jeep
Retail $3.50
Value $3,120.63
Growth  +89060.9%
Annual growth 12.4%

336 Fire Engine

Theme / Subtheme Classic / Vehicle
Year 1968
Pieces 76
Availability Retired
336 LEGO Fire Engine
Retail $4.50
Value $862.83
Growth  +19074.0%
Annual growth 9.5%

340-3 Railroad Control Tower

Theme / Subtheme Classic / Building
Year 1968
Pieces 86
Availability Retired
340-3 LEGO Railroad Control Tower
Retail $4.90
Value $583.91
Growth  +11816.5%
Annual growth 8.6%

341 Warehouse

Theme / Subtheme Classic / Building
Year 1968
Pieces 123
Availability Retired
341 LEGO Warehouse
Retail $7.25
Value $682.56
Growth  +9314.6%
Annual growth 8.2%

342 Station

Theme / Subtheme Classic / Building
Year 1968
Pieces 215
Availability Retired
342 LEGO Station
Retail $11.25
Value $476.40
Growth  +4134.7%
Annual growth 6.7%

343 Train Ferry

Theme / Subtheme Classic / Vehicle
Year 1968
Pieces 147
Availability Retired
343 LEGO Train Ferry
Retail $10.95
Value $790.11
Growth  +7115.6%
Annual growth 7.7%

343-2 Ferry

Theme / Subtheme Samsonite / Model Maker
Year 1968
Pieces 147
Availability Retired
343-2 LEGO Samsonite Model Maker Ferry
Retail $4.95
Value $1,293.67
Growth  +26034.7%
Annual growth 10.1%

502 Deluxe Set with Storage Case

Theme / Subtheme Samsonite / Basic Set
Year 1968
Pieces 451
Availability Retired
502 LEGO Samsonite Deluxe Set with Storage Case
Retail $14.99
Value $566.41
Growth  +3678.6%
Annual growth 6.5%

502-2 Pre-School Medium Set

Theme / Subtheme Classic / Jumbo Bricks
Year 1968
Pieces 8
Availability Retired
502-2 LEGO Jumbo Bricks Pre-School Medium Set
Retail $1.50
Value $315.00
Growth  +20900.0%
Annual growth 9.7%

503-2 Pre-School Large Set

Theme / Subtheme Classic / Jumbo Bricks
Year 1968
Pieces 16
Availability Retired
503-2 LEGO Jumbo Bricks Pre-School Large Set
Retail $2.50
Value $454.25
Growth  +18070.0%
Annual growth 9.4%

301 Piece Set with Suitcase

Theme / Subtheme Samsonite / Basic Set
Year 1968
Pieces 301
Availability Retired
LEGO Samsonite 301 Piece Set with Suitcase
Retail $12.88
Value $558.71
Growth  +4237.8%
Annual growth 6.7%