About $13 to $20 as of 2026-11-09, based on 3 recent eBay sales with a median of $16. Similar ones are listed right now for $20 to $21, but asking prices run higher than what things sell for.
Recent eBay sales: $16 (New Super Mario Bros (Nintendo DS 2004) Authentic Cartridge Only -…); $20 (New Super Mario Bros. (Nintendo DS, 2006) Cartridge Only Authentic…).
Loose cartridge or disc vs. complete in box: the box and manual can add as much as the game itself, so say which you have. Authentic vs. reproduction: popular titles are widely faked. Check the label print, the board inside, and the screws. Region: a US game sells to US buyers. Japanese and PAL copies are a different market and usually sell for less here.
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Guestimates are market estimates from public eBay data at the date shown, not certified appraisals. Prices change; check before you buy or sell. As an eBay Partner, Guestimator may be paid a commission when you buy through links on this page.