Ebgames.com is offering XIII (PC) for only $4.99. In addition, they are also offering a $10 Gift Voucher when you purchase it so when taking the voucher into consideration, the game is free. This is Ubisoft's cel-shaded shooter that was released a while back.

To receive the gift voucher, once you receive the game, fill out this form and mail it in. You should receive your gift voucher within 2 weeks.

XIII (PC) - $4.99 plus $10 gift voucher