Nexus 10s are pretty cheap now, but you should probably just wait for the next one.
Don't get a cheap tablet. It might be fun, but once you get a good model, you won't ever look back. I had a TouchPad and for $99 it was fun, but in the end all the effort I spent updating it, finding hacks, fixes, ugh. It was only useful as a movie platform but I dreaded using it. When I got the iPad 2, it was worlds better. Same with the Nexus 10. I actually use my tablet for daily reading now. I don't have to worry about the battery dying in 3 days in idle anymore.