Adorama has Sandisk 8gb Compact Flash Extreme III Memory Cards for $57 with free shipping. There is a $40 to $160 tiered rebate depending on how many you buy. Buy 1 to get $40 rebate, 2 to get $100 rebate or buy 3 for $160 rebate making it $17, $7 or $3.67 each respectively.I can't believe I'm gonna replace my three 1 gig cards and one 4 gig card for just $11 after rebate. O_o And that's for THREE 8 gig cards.
The rebate is in the form of a VISA debt card FYI, but if you're patient, it's an amazing deal.
Also if you're gonna get memory, make sure your camera even supports 8 or 16 gigs. Some cameras only support up to 4 gig memory cards.