Portal 2 just recently launched, but for some reason retailers all around have decided to slash the price on the title. GameStop is offering the console versions for $39.99, and physical PC copies for $29.99. Amazon is slightly undercutting this with the console versions for $34.99. Other retailers like BestBuy are marking the similar deals.
It’s hard to say whether these are temporary or permanent cut. Either way, if you’re looking for a great puzzler, $20 off or full retail price, you’ll probably get your money’s worth with Portal 2.