If you managed to delay purchasing Valve's gooey, robot-filled puzzler, Portal 2, your patience is about to be rewarded: Two major retailers are significantly cutting the price of the game this weekend. According to the Kmart Gamer Facebook page, the title will be marked down to $34.99 on 360 and PS3 starting May 1 -- an offer that will be running for an undisclosed period of time.

A tipster also sent in an unreleased GameStop circular, revealing that stores will have the 360 and PS3 versions of Portal 2 on sale for a slightly-less-discounted $39.99, but will also have the PC version on sale for $29.99 on April 30. No matter how you slice it, the value-to-science ratio here is simply unbelievable.

[Thanks, MLC!]

This article was originally published on Joystiq.