just keep checking the site... they always add more..... like i said in my previous post...
i assume it's because they get more in (that were rented out) and update the site as they return.
That was the end of the month sale, whereas this is a nightly deal. The deal price only lasts until 5pm PDT tomorrow. Last night's Dynasty Warriors Gundam 3 for PS3 sold out in less than 2 hours as well and was never restocked to my knowledge.
It seems Gamefly has plenty of xbox360 games but only a couple PS3 games to sell.