In 1958, LEGO released 24 System i Leg Supplemental sets, all of these sets have been retired. For that year, the total price of all retail sets cost $14, today those sets are valued around $2,465.
Most valuable 1958 LEGO System i Leg Supplemental set
230-2 Six Trees and Bushes $323.71
Largest 1958 LEGO System i Leg Supplemental set
222-2 1x1 Bricks 62 pieces
Most owned 1958 System i Leg Supplemental set
223-2 1x1 Round Bricks
24 sets

214-2 Red Windows and Doors

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 10
Availability Retired
214-2 LEGO Red Windows and Doors
Retail $0.50

214-3 White Windows and Doors

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 8
Availability Retired
214-3 LEGO White Windows and Doors
Retail $0.50

215-2 2x8 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 6
Availability Retired
215-2 LEGO 2x8 Bricks
Retail $0.50
Value $181.90
Growth  +36280.0%
Annual growth 8.0%

216 2x10 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 5
Availability Retired
216 LEGO 2x10 Bricks
Retail $0.50
Value $48.25
Growth  +9550.0%
Annual growth 5.9%

217-2 4x4 Corner Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 5
Availability Retired
217-2 LEGO 4x4 Corner Bricks
Retail $0.50
Value $89.41
Growth  +17782.0%
Annual growth 6.8%

218-2 2x4 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 13
Availability Retired
218-2 LEGO 2x4 Bricks
Retail $0.50
Value $129.38
Growth  +25776.0%
Annual growth 7.4%

219 2x3 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 15
Availability Retired
219 LEGO 2x3 Bricks
Retail $0.50
Value $124.23
Growth  +24746.0%
Annual growth 7.4%

220 2x2 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 33
Availability Retired
220 LEGO 2x2 Bricks
Retail $0.50
Value $124.23
Growth  +24746.0%
Annual growth 9.1%

221-2 1x2 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 45
Availability Retired
221-2 LEGO 1x2 Bricks
Retail $0.50
Value $96.52
Growth  +19204.0%
Annual growth 7.0%

222-2 1x1 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 62
Availability Retired
222-2 LEGO 1x1 Bricks
Retail $0.50
Value $111.51
Growth  +22202.0%
Annual growth 7.2%

223-2 1x1 Round Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 62
Availability Retired
223-2 LEGO 1x1 Round Bricks
Retail $0.50
Value $69.58
Growth  +13816.0%
Annual growth 6.4%

224-3 2x2 Curved Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 20
Availability Retired
224-3 LEGO 2x2 Curved Bricks
Retail $0.50
Value $16.93
Growth  +3286.0%
Annual growth 4.3%

226 8 Named Beams

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 8
Availability Retired
226 LEGO 8 Named Beams
Retail $0.50
Value $194.10
Growth  +38720.0%
Annual growth 8.1%

227 4x8 Curved & 2x8 Plates

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 5
Availability Retired
227 LEGO 4x8 Curved & 2x8 Plates
Retail $0.50

228 4x8 & 2x8 Plates

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 5
Availability Retired
228 LEGO 4x8 & 2x8 Plates
Retail $0.50
Value $98.82
Growth  +19664.0%
Annual growth 7.0%

229 6x8 & 2x8 Plates

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 8
Availability Retired
229 LEGO 6x8 & 2x8 Plates
Retail $0.50
Value $88.47
Growth  +17594.0%
Annual growth 6.8%

230-2 Six Trees and Bushes

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 6
Availability Retired
230-2 LEGO Six Trees and Bushes
Retail $0.50
Value $323.71
Growth  +64642.0%
Annual growth 8.9%

232-2 16 Road Signs

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 16
Availability Retired
232-2 LEGO 16 Road Signs
Retail $0.50
Value $192.93
Growth  +38486.0%
Annual growth 8.1%

233 Light Masts

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 4
Availability Retired
233 LEGO Light Masts
Retail $0.50
Value $127.12
Growth  +25324.0%
Annual growth 7.4%

234 Letter Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 50
Availability Retired
234 LEGO Letter Bricks
Retail $0.50
Value $99.97
Growth  +19894.0%
Annual growth 7.0%

235 Garage Plate and Door White Base and Door Frame

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 3
Availability Retired
235 LEGO Garage Plate and Door White Base and Door Frame
Retail $0.75
Value $67.59
Growth  +8912.0%
Annual growth 3.3%

242 International Flags

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 6
Availability Retired
242 LEGO International Flags
Retail $0.50
Value $124.23
Growth  +24746.0%
Annual growth 7.4%

242-2 5 Danish Flags

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 5
Availability Retired
242-2 LEGO 5 Danish Flags
Retail $0.50
Value $135.82
Growth  +27064.0%
Annual growth 7.5%

245 Lighting Device Pack

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 3
Availability Retired
245 LEGO Lighting Device Pack
Retail $1.75
Value $20.00
Growth  +1042.9%
Annual growth 3.7%