e-tube, you decided not to keep them? couldn't find an amp or what? also remember, according to this forum's rules, you're not allowed to directly speak of selling, just valuation.
selling prices for the QLS1 vary widely as of late, depending on area, condition, and whether anyone is actually on the lookout for a pair. the economy isn't great, either, but that just slows things down so you have to be more patient to get a better price. you can try to check eBay's current and completed listings for some idea. the best i can say is, if they're working and not trashed, somewhere between $1k and $2k.