Kingston 2GB MicroSD Card with Adapter – 2 Pack
$6.49 + $5 shipping

For those not familiar with woot.com, when they're gone, they're gone (max one day deal).
Also, the $5 shipping is for 1, 2, or 3 orders (so 2, 4, or 6 cards).

I bought these from woot a couple months back and they work flawlessly in my N800.
However, it's a tiny bit awkward to pull the cards out of the "external" slot... don't cut your fingernails too short!