The following cards are on sale at Adorama and Amazon. Not only are these prices phenomenal, the shipping is free too!
BUT, these prices are good only for the next three days (ending November 30th).
8 GB Cards:
SanDisk 8 GB Extreme III Compact Flash Memory Card $29.95
SanDisk 8 GBExtreme III Secure Digital Memory Card $29.95
4 GB Cards
SanDisk 4 GB Extreme III Compact Flash Memory Card $19.95
SanDisk 4 GB Extreme III Secure Digital Memory Card $19.95