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 $21,602.
Most valuable 1968 LEGO set
330-4 Jeep $3,030.83
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 $258.06
Growth  +9284.0%
Annual growth 8.2%

011 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 102
Availability Retired
011 LEGO Basic Building Set
Retail $3.25
Value $201.93
Growth  +6113.2%
Annual growth 4.2%

022 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 110
Availability Retired
022 LEGO Basic Building Set
Retail $2.25
Value $94.84
Growth  +4115.1%
Annual growth 13.5%

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 $182.23
Growth  +1818.2%
Annual growth 3.7%

044 Basic Building Set

Theme / Subtheme Classic / Basic Set
Year 1968
Pieces 234
Availability Retired
044 LEGO Basic Building Set
Retail $6.75
Value $209.96
Growth  +3010.5%
Annual growth 6.1%

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

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 $257.02
Growth  +2184.6%
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 $467.93
Growth  +3513.4%
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 $253.57
Growth  +1648.8%
Annual growth 5.1%

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 $1,310.64
Growth  +6456.5%
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 $1,520.61
Growth  +7522.1%
Annual growth 6.7%

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 $1,554.50
Growth  +9929.0%
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

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 $52.50
Growth  +1809.1%
Annual growth 4.7%

160 Magnetic Couplings

Theme / Subtheme Trains / 4.5V
Year 1968
Pieces 6
Availability Retired
160 LEGO Trains Magnetic Couplings
Retail $1.00
Value $19.75
Growth  +1875.0%
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 $305.61
Growth  +6024.4%
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 $32.24
Growth  +3124.0%
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 $476.11
Growth  +9479.7%
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 $460.54
Growth  +3904.7%
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 $3,014.51
Growth  +80286.9%
Annual growth 12.2%

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 $3,030.83
Growth  +86495.1%
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 $836.16
Growth  +18481.3%
Annual growth 9.4%

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 $573.70
Growth  +11608.2%
Annual growth 8.6%

341 Warehouse

Theme / Subtheme Classic / Building
Year 1968
Pieces 123
Availability Retired
341 LEGO Warehouse
Retail $7.25
Value $667.87
Growth  +9112.0%
Annual growth 8.1%

342 Station

Theme / Subtheme Classic / Building
Year 1968
Pieces 215
Availability Retired
342 LEGO Station
Retail $11.25
Value $467.21
Growth  +4053.0%
Annual growth 6.6%

343 Train Ferry

Theme / Subtheme Classic / Vehicle
Year 1968
Pieces 147
Availability Retired
343 LEGO Train Ferry
Retail $10.95
Value $1,343.24
Growth  +12167.0%
Annual growth 8.7%

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 $1,252.01
Growth  +25193.1%
Annual growth 10.0%

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 $557.67
Growth  +3620.3%
Annual growth 6.4%

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 $307.33
Growth  +20388.7%
Annual growth 9.6%

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 $443.42
Growth  +17636.8%
Annual growth 9.3%

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 $549.86
Growth  +4169.1%
Annual growth 6.7%