Well sorry to disappoint those who didn't want more demand for the N900s, but thanks to zlatokosi I just bought one on ebay for $150.

I'd been looking on Amazon where new ones were going for $300+. I figure at $150 and a no contract data plan it is at least worth trying for a bit, if it doesn't work out I should be able to sell the N900 without much loss and either pick up a N9 or an Android phone.