I'm going to commit the cardinal sin of recommending something you explicitly didn't want, but have you considered
the Amazon Fire 7" tablet? It's only $49.99 and at 7", it isn't as little and fiddly as a cellphone. Navigation isn't difficult, but on the other hand, for something to listen to in bed, it's small and light. It's compatible with OverDrive, and Audible, if you get interested, is already loaded.