I sold my Acoustimass 7 (~4 years old) last fall for $350 on eBay -- no original box, but original manual and cables. The AM10 is selling for a fair bit more than that. Try these two links: active eBay auctions and completed eBay auctions . It may give you some idea of what the "market rate" is currently.

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review