"There are plenty of sites where you can get free public domain books including here on mobileread plus look out for sales at whsmiths and waterstones ebook sections."
First of all welcome to the site buddy!
Poshm is 200% correct. The classics are available for free on many sites to include this one.
The books you will recieve on the ebay will most likely be (if at all legal) the sloppy google public domain scans. You can make almost as much of a hobby in hunting down the nicely illustrated or constructed books as you can actually reading the book.
There is much thrill in the hunt.