Ah, that’s a shame. It’s definitely the cheapest decent tablet I can think of. I guess your next best port of call is some kind of Android tablet. Perhaps a Nexus?
Well, among the name brand tablets, the HP Slate 7 (1024×600) can usually be found dirt cheap. Also – Lenovo IdeaTab (1024×600) are often found for < $150. There's probably all kinds of no-name tablets available cheap and it probably doesn't matter much which one you choose.
Even though its not the cheapest choice, I personally would try to stretch my budget and get a Nexus 7 tablet.
Lotta bang for the buck with the nexus. It’s one of the nicer mini tablets and it’s also cheap(ish). I love my n7, I have the 2nd gen 32gb, not the 2013 version.
The Nexus 7 has a much, much better display, faster processor, more memory than the cheaper choices. All in all it will offer a much more pleasant user experience.
Also, I don’t own a Nexus myself, but have toyed with them a little. The best thing about them is it’s direct from Google, so you’re gonna get excellent update support down the line.