Hoodoo, the little Amazon Kindles are pretty cheap if you watch for them on eBay . I had to watch for a while, but I got mine for about $20, which is a good price for all the benefits you have with it.
It is not a regular tablet that you can browse online with, although I have looked at some of those for around $40, and then you can do everything with them.
You can actually download a kindle app for any computer, and read books that way. I don't like to read on a regular computer, or even the laptop, because it is just a lot more comfortable to hold something in your hands like we do with a regular book.
I signed up at
www.bookbub.com and they tell you when books you might like are available either on a serious markdown sale, and sometimes, for free. How it works, is that you fill out a profile about what kinds of books you like to read, and where you like to buy books from, and then they send you emails about books on sale. You can make is as broad or as limited as you prefer, so you can get just the books you are interested in. It is free to sign up at Bookbub, and if you do a lot of reading, it is a great website.