I notice that buy.com does have n810s in stock, but they aren't as cheap as the one you bought. I wonder if you're going to be waiting a long time for your tablet, because your SKU was for a special discounted price, which they have sold out of... I think you may have to cancel your order and buy the more expensive one.

buy.com: N810 for $250

EDIT: Aha, buy.com isn't selling this one, it is from "Electronica Direct" who are selling through buy.com's "Marketplace"... That's why it's more expensive, and why it is in stock...

If I were you, and I was as desperate as you sound, I'd just bite the proverbial bullet, pay the extra, and get the tablet