If you can stretch a bit more, then the Onda Vi40 I have seems to have support. At that price, other models also come into play. A bit early to tell, but I think Onda have a good history with MP4 players and updating.
Comes rooted with ICS 4.03.
I would check out the hardware and reviews. I made a list of what I wanted (10" IPS" 1024x768 etc.) and what I could live without/add (GPS/3G) and then went for a company that had some semblance of support.
Personally, In Europe, and as you're clearly on a budget and can't afford a mistake, I'd buy locally, including the internet, as you'd get a better guarantee and chance of refund/return if you get a lemon, whatever you choose.
I think, as always, you get what you pay for and many people have bought the cheapest and regretted it. Even here in China (where I teach) the sellers quote "firmware upgradable" but when searching, you find a "clone" is not the same as another and firmware updates can be impossible to find.
There's a wealth of information out there, and the Android community is a great resource. My tablet has no following yet, so maybe you could look for a device that has an active following and development. Then, you'd know where to go for help. If unsure, a device-specific commuinity can also point you in the right direction to check you are getting what you think you are.
Good luck in choosing.
David.
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