This deal has ended.
Buy.com has the 1gb Sandisk Mobile Memory Stick Pro Duo for $14.29 after a $15 mail-in rebate valid through 6/24. Shipping is free and there is no sales tax (except CA, MA, MD, TN). New customers can use this $5 off $50 coupon and new Google Checkout users can get a $10 off discount for signing up (but you can't get both). The "Pro Duo" is half the size of the standard Memory Stick "Pro" cards but can be used in all Pro-compatible devices, including cameras, camcorders and the Sony PSP.