I bought my Thrive 32gb refurb at Woot.com. Their standard shipping policy is something like 7-10 days too. I'm assuming these refurbs come from Toshiba directly.
1saleaday has offered the Thrive several times this year for either the 16gb or 32gb version. Yes, they are reputable, and they had been selling out quick on the Thrive's. This is the cheapest I've seen them sell the 16gb, though. If you miss out on this deal then keep an eye on Woot.com too, or watch SlickDeals web site.