I can't help with this exactly, but using buy.com, I picked up a 1GB microSD for about $10 and a 2GB for about $13 (then used Google Checkout on both - whoo!).
I'm guessing your best bet would be to keep an eye on buy.com.
$27, free shipping (-$10 with GCO deal). Currently out of stock, but they're still taking orders and it says they'll ship as soon as they have some in.