Either eBay or craigslist. I'd personally go with craigslist, because eBay will get a nice percentage of your sale price. Since you didn't mention whether it's an 11" or 13", nor did you say how old it was, nor whether I will assume it's no more than 5-6 months old, and it's maxed out, I would be selling that bad boy for 1800.00 (11" - 2149.00 new), and 1900.00 (13" - 2199.00 new).