Take it for what it's worth but CellHut.com is advertising the HTC Radar (unlocked) for $599.99 (on sale from $739.98) and the HTC Titan (again, unlocked) for $799.99 (on sale from $899.98). Both phones are listed as compatible with AT&T, T-Mobile, Cellular One and a number of other carriers.
Compared to the Average Retail Value Microsoft has placed on the Titan in their Big Box of Awesome 2 contest ($499.99) the prices are a little on the steep side. Hopefully the discounted prices will continue to lower.
Oh... one caveat in dealing with online retailers is to always check out their scores on resellerratings.com. It might save you some headaches.
Thanks goes out to John for the tip!