Grab Metal Gear Solid 4: Guns of the Patriots for $54.99 (save $5) with free shipping over at Buy.com.

As always, save an additional $10 and snag it for $44.99 if new to Google Checkout.

This price is valid through 6/15 or until they sell out (edit:  live as of 6/16, but they will pull it any moment).

Check it out:  Buy.com - Metal Gear Solid 4

Details:

MGS4 is a next-generation adventure set in the aftermath of MGS2: Sons of Liberty. The concept behind the latest Metal Gear Solid project is "no place to hide," and this edition in the series will force Snake into unexpected circumstances with an all-new storyline that breaks away in some ways from the previous MGS franchise entries. We don't want to spoil it for you, but, producer Hideo Kojima did reveal some very juicy tidbits about the game and the storyline when it was first announced at E3 of 2006. "Until now," said Kojima, "we've released two entries of the MSX2 Metal Gear series, and three entries in the Metal Gear Solid series. Add to this Portable Ops, and you get a total of six titles. All mysteries will be cleared up in Metal Gear Solid 4."