This deal has ended.
Buy.com has the Dane-Elec 4GB Secure Digital (SD) Card on sale for just $11.95 after a $19 mail-in rebate (expires 4/8). It's well reviewed, receiving 4.5 out of 5 stars in overall satisfaction from 52 buyers. Shipping is free and there's no sales tax (except CA, MA, MD, TN). Sign up for a new Google Checkout account to get an additional $10 discount.