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The most valuable MINDSTORMS LEGO sets from the 1990s by current market value. This list ranks 14 sets by current BrickPicker value, refreshed from live market data. Right now the top spot belongs to Robotics Invention System Upgrade Kit at $1,199. The top 5 alone account for about 89% of the value on this list. Every entry links to its full price history and marketplace listings. Updated 2026-07-22.
Top 5 hold 89% of this list's value ($2,090).
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| Name | / piece | |||
|---|---|---|---|---|
| 1 |  Robotics Invention System Upgrade Kit Mindstorms · 1999 | $1,199 | +4698% | $17.13 |
| 2 |  Robotics Discovery Set Mindstorms · 1999 | $230 | +53% | $0.59 |
| 3 |  Robotics Invention System 1.5 Mindstorms · 1999 | $215 | +8% | $0.30 |
| 4 |  Robotics Invention System Mindstorms · 1998 | $120 | -40% | $0.16 |
| 5 |  Droid Developer Kit Mindstorms · 1999 | $100 | +0% | $0.15 |
| 6 |  RCX Programmable LEGO Brick Mindstorms · 1999 | $80 | -28% | $79.58 |
| 7 |  Extreme Creatures Mindstorms · 1998 | $33 | -34% | $0.22 |
| 8 |  Robo Sports Mindstorms · 1998 | $32 | -36% | $0.35 |
| 9 |  RCX Remote Control Unit Mindstorms · 1999 | $21 | +6% | $21.03 |
| 10 |  Infrared Transmission Tower Mindstorms · 1998 | $20 | -20% | $9.99 |
| 11 |  Rotation Sensor Mindstorms · 1999 | $20 | +31% | $19.61 |
| 12 |  Touch Sensor Mindstorms · 1999 | $13 | +18% | $6.48 |
| 13 |  Light Sensor Mindstorms · 1999 | $6 | -71% | $5.81 |
| 14 |  Temperature Sensor Mindstorms · 1999 | $3 | -88% | $2.83 |
The 3803 Robotics Invention System Upgrade Kit is the most valuable, worth about $1,199 on the current market.
Around $1,199 — that's the current BrickPicker value of the 3803 Robotics Invention System Upgrade Kit, the top-ranked set on this list.
This list ranks 14 mindstorms lego sets of the 1990s by current market value, refreshed from live sales data.