check out slick deals here
http://slickdeals.net/?permadeal=8201#direct_deal_8201
what you do is put the card in your shopping cart over at buy.com....
next you need to add a 1.50 to up your total to over 30 dollars
now go to checkout but scroll down and use google check out instead beacause you get 10 dollars off of 30 dollar purchase
now you have yourself this 512 SD card ($29) and a book ($1.50) - $10 google checkout - $19 kingston mail in rebate + $0.00 for shipping = about $1 for a nice little card for storage!