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Be cautious with the tablets on eBay, many are cheap Chinese knock-offs that either run older versions of Android or have extremely poor support. Even the better tablets there are rather high maintenance. The most reliable of the Chinese 10-inch tablets is the Zenithink ZT-180. I've read accounts of a number of owners who have had good success with tme. Don't be surprised, however, if you find yourself flashing new versions of Android onto the tablet.
Another brand you could possibly look at would be Archos. It's a European company and it makes decent tablets. Archos recently released their 101 which is a 10.1-inch Android tablet.
What is the price range that you are looking for?