Try auto trader, cars like the Mystique sell REALLY well because of their amenities. I've seen mystiques with higher mileage for around 4600 (prolly $5000 after taxes and fees) if you sell them on Auto trader. eBay though will allow you list your car with pictures for what, a few dollars as their current promotion? What I would also do, is spend maybe $30 to $40 on cleaning products. Get Simple Green Auto for the engine, armorall wipes or Turtle Wax F21 super protectant for the interior, and seat wipes. Now get some synethtic wax and polish and do the exterior. Make the car look like it's worth more and you'll definitely get top dollar for it.