Where can I find simple reading gles that have no correction on top?

I would like to find some reading gles that I can wear all the way on my nose without "peeking" over them to see at distance. In other words, the magnification would be on the bottom, and they would be clear on top. Alternatively, the lens would be a half lens, so that I would not be looking through the lens at all except when looking down to read. I'd rather not spend the money to have some made by an optometrist if I can find some simple readers. If you find them online, please include a link in your answer. Thanks!