Yeah, you can easily get 75-95% of the full retail cost of a device if you sell at the right time. And forums are even better than Swappa and eBay in my opinion. This forum doesn't have a section for buying/selling/trading, but others do. No fees and smooth transactions all around in my experience. I do a little on eBay from time to time, but I like to stick to the forums for that sort of thing.