[Q] What's the cheapest smartphone for tethering/server?

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http://forum.xda-developers.com – What's the cheapest smartphone with HSDPA 7.2mbps I can buy? I plan to use it for WiFi tethering. Used is cool. I'll consider Android, iOS and Windows Mobile. I'll try to avoid Symbian and Blackberry OS but I might consider if it hits the correct price spot. No J2ME devices please. Android preferred. I'm comfortable with rooting and so Android 2.2 is not a must. And, yes, WiFi is a must too. Display quality and other stuff don't matter. I found some myTouch 3G on eBay but that's about it. Whatever happened to all those old budget smartphones? (HowTos)