Here are a few of the Viking CF Card deals from Amazon
Viking 512 MB CompactFlash Card is
$89.49 with free shipping and no sales tax in most states after a $25 rebate (exp 4/30)
Viking 1 GB CompactFlash Card (CF1GB)
for $163.64 with free shipping after a $45 rebate (exp 4/30)
Viking 256MB Compact Flash card for
$30.84 with free shipping after a $15 rebate from Viking expires 4/30 and no tax in most states