The Amazon.com Video Games Deal of the Day offers a one-day sale of $20 off all editions of Prototype, making the Windows edition $29.98 and the Xbox 360 and PlayStation 3 editions $39.98 for today only (thanks Joystiq). Also, over on GameStop they are offering a sale on "thousands" of games for under $20.00. Meanwhile, Shrapnel Games are celebrating their tenth anniversary, and this post outlines a bunch of sales that are running between now and July 22. Finally, Meridian 4 continues to celebrate their fifth anniversary, and all their games are on sale on Impulse for 50% off, and The Meridian4 Complete Pack is available for $79.99, described as a $360.00 discount off the full price.