# Ultimate Accessory Set #3801 — resale value

**Ultimate Accessory Set #3801** is worth about **$14** loose, based on real closed eBay sales. Sealed or new examples sell for around **$48.76**.

## Value by tier

| Condition | Value (USD) |
| --- | --- |
| Loose | $14 |
| Complete (CIB) | $32 |
| Sealed (new) | $49 |

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%2520Ultimate%2520Accessory%2520Set%25203801%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%2520Ultimate%2520Accessory%2520Set%25203801%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

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## Details

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

## Ultimate Accessory Set #3801 (LEGO Mindstorms) resale value

A loose Ultimate Accessory Set #3801 set runs around $14, a complete copy (all pieces + box + instructions) about $32, and a factory-sealed box commands $49.

### 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 Accessory Set #3801?**

If you don't need the box, the loose version is the most affordable at $16.

**Can I buy this set in new, unopened condition?**

Yes, the sealed, new version of Ultimate Accessory Set #3801 is available for $50.

**How much is the complete, in-box version of this Mindstorms set?**

The Complete (CIB) version of Ultimate Accessory Set #3801 is priced at $28.

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Full price guide: https://junkpal.ai/products/ultimate-accessory-set-3801-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)"