Sold a couple for $500 last week. Wasn't planning on upgrading, then I saw the price point on the iPhone4. Decided to put up my 3G's to see what would happen. Got over 20 responses in less than 24 hrs and ended up with more than asking. The only downside was that I sold them too quickly and wife wasn't too happy about not having a phone for a few days; took me a while to find iPhone4's in stock.
"You think that's air you're breathing?"