There's actually not that many people here percentage-wise, and many eplaya users are not local to your area, making a swift transaction and pick up very iffy.
Check out the regional burn groups and related yahoo groups, find out if they have message boards or Facebook pages where sales are permitted. Tribe.net may be of use also.
Edited to add: eBay motors. Oddly enough, people do see it there then talk about it here. Just as long as the seller isn't doing the original posting, or pitching in about selling it, discussion about what is for sale usually flies (and perhaps arguing about selling anything using the name Burning Man but you knew that).
Some sunshine, some dust, a little paint and a tutu. Yeah.