You can share some titles on a Kindle but not that many.
I create reading lists of the books I want to buy and then check the prices of them. They usually come down in value and when they get to a price I find reasonable, I buy it.
If you want cheap books, buy old ones or not very popular ones. There's always offers for 99p books too. I prefer to get books I want to read, not ones that are just going for cheap.
I used to use this. But I ended up buying too many books I've haven't read. As above I prefer paying for books I want to read than just what's cheap/free. But often you can get books on your wish list to store up.
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I tried the library one but it was clunky. They may have a better system now.