The one thing with the 360 version being sold out. For whatever reason when GS put these back on the website, they didn't limit the amount you could order for the 360. They did for the PS3 and there still is a limit of 2. Not sure why but I think that contributed to why the 360 sold out and why the PS3 is still in stock.
Some people probably ordered 10 copies to flip on eBay.