Several years ago i bought a 2nd hand Pocketbook Touch Lux 2 for around $50. It still loads every format (epub, pdf, etc) i throw at it. The device is pretty slow, but works for lazy reading. My wife couldn't read of it, but loves her (way more expensive) Kobo reader. If i had to purchase an eReader right now i guess i'd go for some 2nd hand Kindle, since they're all hackable these days.