Rakuten still has the 2-pack Sony 16GB SDHC Class 10 SD Memory Cards for just $17.95 w/free shipping.

If you add 3 to your cart, you can use coupon code SAVE20 bringing the total down (for 6 16GB SD cards!) to just $33.85 w/free shipping!

Sony 16GB SDHC Class 10 SD Memory Cards LINK