Robotics Invention System [1.5] #9747 — LEGO Mindstorms Set Value
LEGO MindstormsWhat the Robotics Invention System [1.5] #9747 LEGO set is worth — loose, complete, and sealed.
Robotics Invention System [1.5] #9747 value — Loose $24 · Complete (CIB) $81 · Sealed (new) $188. Prices updated August 2026.
Theme · LEGO Mindstorms
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↘ Falling · -10%
Complete-in-box price history
Monthly CIB value, based on sold comps.
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Item details
- UPC / EAN
- 042884097479
- Brand
- LEGO
- Theme
- LEGO Mindstorms
- Set number
- #9747
- Release date
- January 1, 1999
Robotics Invention System [1.5] #9747 (LEGO Mindstorms) resale value
A loose Robotics Invention System [1.5] #9747 set runs around $24, a complete copy (all pieces + box + instructions) about $81, and a factory-sealed box commands $188.
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 |
|---|---|---|
| Loose | $24 | eBay sold comps |
| Complete (CIB) | $81 | eBay sold comps |
| Sealed (new) | $188 | eBay sold comps |
Frequently asked questions
- What is the best value condition for this LEGO Mindstorms set?
- The loose condition offers the best value at $23, but the CIB option at $81 provides a complete experience.
- Is the sealed version of the Robotics Invention System [1.5] available?
- Yes, the sealed, new version of the LEGO Mindstorms set is available for $188.
- How much does the complete in box version cost?
- The complete in box (CIB) version of the Robotics Invention System [1.5] is priced at $81.
