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Much of these books you can borrow for free on your kindle from a library though.

Unfortunately you still have to physically go to the library to get them sent to your kindle. It's almost worth $5-10 to me to not have to do that.

Edit: I think I need to have a chat with my library.

No you don't, at least not universally. I get mine sent to me, I think most libraries use the same system (Overdrive).

My library systems lets you check them out and download them completely online. Never need to leave the house.