You can list your item in the Fleamarket section (https://www.mobileread.com/forums/forumdisplay.php?f=124). I've sold a few readers there and you don't have to pay a fortune to eBay that way. Items usually sell quickly in the Fleamarket, at least in my cases.

EDIT: Just noticed you only have two posts, so it would probably have a bit more trouble getting sold in the Fleamarket.