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 $2,440.
Most valuable 1958 LEGO System i Leg Supplemental set
230-2 Six Trees and Bushes $319.54
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 $180.29
Growth  +35958.0%
Annual growth 7.9%

216 2x10 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 5
Availability Retired
216 LEGO 2x10 Bricks
Retail $0.50
Value $48.03
Growth  +9506.0%
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 $88.71
Growth  +17642.0%
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 $128.30
Growth  +25560.0%
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 $122.87
Growth  +24474.0%
Annual growth 7.3%

220 2x2 Bricks

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 33
Availability Retired
220 LEGO 2x2 Bricks
Retail $0.50
Value $122.87
Growth  +24474.0%
Annual growth 9.2%

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 $95.52
Growth  +19004.0%
Annual growth 6.9%

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 $110.31
Growth  +21962.0%
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 $68.90
Growth  +13680.0%
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 $16.35
Growth  +3170.0%
Annual growth 4.2%

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 $191.80
Growth  +38260.0%
Annual growth 8.0%

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 $97.79
Growth  +19458.0%
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 $87.57
Growth  +17414.0%
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 $319.54
Growth  +63808.0%
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 $190.64
Growth  +38028.0%
Annual growth 8.0%

233 Light Masts

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 4
Availability Retired
233 LEGO Light Masts
Retail $0.50
Value $125.72
Growth  +25044.0%
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 $98.93
Growth  +19686.0%
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 $68.88
Growth  +9084.0%
Annual growth 3.7%

242 International Flags

Theme / Subtheme System i Leg / Supplemental
Year 1958
Pieces 6
Availability Retired
242 LEGO International Flags
Retail $0.50
Value $122.87
Growth  +24474.0%
Annual growth 7.3%

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 $134.31
Growth  +26762.0%
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%