# Ultimate Builders Set #3800 — resale value

**Ultimate Builders Set #3800** is worth about **$40** loose, based on real closed eBay sales. Sealed or new examples sell for around **$83.75**.

## Value by tier

| Condition | Value (USD) |
| --- | --- |
| Loose | $40 |
| Complete (CIB) | $50 |
| Sealed (new) | $84 |

Values are medians of real closed eBay sales, updated 2026-08-06. They are estimates for reference, not offers or appraisals — condition, completeness and edition move them a lot, so compare against the sold listings before pricing anything.

## Check the market

- [Sold listings on eBay](https://junkpal.ai/api/go?to=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_nkw%3DLEGO%2520Mindstorms%25203800%26LH_Sold%3D1%26LH_Complete%3D1%26mkcid%3D1%26mkrid%3D711-53200-19255-0%26siteid%3D0%26campid%3D5339166094%26toolid%3D10001%26mkevt%3D1%26customid%3Dmd-sold&p=md-sold) — the closed sales these medians are computed from
- [Live listings on eBay](https://junkpal.ai/api/go?to=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_nkw%3DLEGO%2520Mindstorms%25203800%26mkcid%3D1%26mkrid%3D711-53200-19255-0%26siteid%3D0%26campid%3D5339166094%26toolid%3D10001%26mkevt%3D1%26customid%3Dmd-live&p=md-live) — what sellers are asking right now

eBay links are affiliate links: JunkPal may earn a commission at no cost to you.

## Details

| Field | Value |
| --- | --- |
| Brand | LEGO |
| Theme | LEGO Mindstorms |

## Ultimate Builders Set #3800 (LEGO Mindstorms) resale value

A loose Ultimate Builders Set #3800 set runs around $40, a complete copy (all pieces + box + instructions) about $50, and a factory-sealed box commands $84.

### 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.

## FAQ

**What is the best deal for Ultimate Builders Set #3800?**

If you need it immediately, the Loose condition is the most affordable at $47.

**How much is the set if it is brand new and sealed?**

A sealed, new copy of the Ultimate Builders Set #3800 is currently listed for $95.

**Is the Complete (CIB) version worth buying over the loose version?**

Yes, the Complete (CIB) version offers better value for $87 compared to the loose version at $47.

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Full price guide: https://junkpal.ai/products/ultimate-builders-set-3800-lego-mindstorms-lego
How these values are computed: https://junkpal.ai/methodology
Cite as: "JunkPal price guide value as of 2026-08-06, based on real sold listings (junkpal.ai)"