Robotics Invention System Upgrade Kit #3803 — LEGO Mindstorms Set Value
LEGO MindstormsWhat the Robotics Invention System Upgrade Kit #3803 LEGO set is worth — loose, complete, and sealed.
Robotics Invention System Upgrade Kit #3803 value — Sealed (new) $1,199. Prices updated August 2026.
Theme · LEGO Mindstorms
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Item details
- Brand
- LEGO
- Theme
- LEGO Mindstorms
Robotics Invention System Upgrade Kit #3803 (LEGO Mindstorms) resale value
A loose Robotics Invention System Upgrade Kit #3803 set runs around null, a complete copy (all pieces + box + instructions) about null, and a factory-sealed box commands $1199.
What drives the price
Retired sets, completeness (every piece + minifigs + instructions + box), and sealed condition drive LEGO value. Exclusive sets and discontinued themes appreciate the most; minifigs alone can carry significant value.
Price guide
What this actually trades for — sold values by condition vs. what sellers are asking today
| Condition | Value | Based on |
|---|---|---|
| Sealed (new) | $1,199 | eBay sold comps |
Frequently asked questions
- Is this LEGO Mindstorms kit new in box?
- Yes, the Robotics Invention System Upgrade Kit #3803 is sealed and brand new.
- What is the theme of this item?
- The theme for this item is LEGO Mindstorms.
- What is the listed price for the sealed kit?
- The sealed, new kit is listed for $1199.
