Don't know if this has been posted yet but Game Deal Daily has one month plus trial codes for 3.29. The codes expire on march 31st and do not stack. You will need a credit card to redeem since they are trial codes. Codes will work even if you've had plus before. I received my code a few hours after I checked out with paypal. Not exactly a great deal but it's great for some of us that just want to wing it another month for ps plus sales
http://www.gamedealdaily.com/store/product.php?product=2000
http://www.gamedealdaily.com/store/product.php?product=2000