So it is today: Newegg has a 4GB Kingston SDHC memory card for $6.99. No rebates, no shipping charges.
That's the lowest price I've seen yet on a 4GB card (though only by $1). If you found a new digital camera under the tree last month, you definitely need high-capacity storage to go with it. A 4GB card can store about 800 10-megapixel snapshots or 60 minutes of video.
And, hey, there's nothing wrong with packing a spare card, in case you spot, say, Bigfoot. Or Paris Hilton. Or Bigfoot at a club with Paris Hilton. Could happen.
This isn't some no-name brand, either. All Kingston memory cards come with a lifetime warranty. Thus, this is pretty much a no-brainer for anyone who needs extra storage. A 4GB SDHC card for 7 bucks may be boring, but it's still a helluva deal.