Buy.com has the Lexar 512MB Secure Digital Card for $43 - $25 rebates [Exp 8/21] = $18 w/ free shipping.

Lexar 512MB Secure Digital Card (http://www.dealwrap.com/#911734)

The new $5 off $35 (http://www.dealwrap.com/exec/go.php?p=buyc&i=87815482) coupon [Exp 8/18] brings it down to $12.95 w/ free shipping!