Welcome to MobileRead, prodygi.
Start here for free books. Look above, see the "ebooks" tab? Over 14,000 so far, hand formatted by our own members, and I'll bet if you compare a book downloaded from here to one from google, you'll prefer the one from here.
also, check out your local library to see if they have a decent collection of ebooks in epub or pdf format. Your sony can read both, and you just download to your computer, then side load to your sony.