I am not seeing one for $500 on Ebay. I found one for $565, but I am not sure what test fixture it comes with. I don't want to have to buy a test fixture as well, the one it is supposed to come with is quite good from what I have read.
Also, I don't mind buying used in the US as returns are not that painful, but buying used overseas makes returns a bit more difficult. Yes, buying new overseas also make returns difficult, but there is a less likely chance of a return.