I tried doing that, but i just couldnt do it comfortably, and it took me 5 or 6 hours to get through what was probably 2 hours worth of prose for me on the PSP

I can see the purpose in an ereader, but i just don't find them as confortable as a real book, and half the point of reading a good book is the feel of it (for me at least), so im afraid based on my experiences i'd tell you to stick with second hand shops and Amazon for books...between them its a fairly low cost habit