If you are ok with simply getting *loans*, give a try to OpenLibrary.org. This lending library is affiliated with archive.org. You can sign up for a free account (requires a valid email address, no other information), and can borrow books for 2-week period.
They only have the pdf scan, and epubs which are raw OCR from the the pdf (not proofed or well-formatted). But if you can stand reading in pdf, for titles you can't get hold of elsewhere, it is very useful.
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