[TheAceOfHearts]

Depending on how many books you read, it might be well worth buying a Platinum Membership. It costs $229.50/year and it comes with 24 credits, which means you pay $9.56 per book. After that you can buy additional credits for roughly the same rate, based on my purchase history it varies between $9.56 and $9.37 per credits.

I definitely wouldn't have bought as many as I have if it wasn't so cheap. I just recently passed my 400th book, which is pretty insane because there's still TONS of stuff for me to work through. Assuming each book was priced at $9.56, my library would be worth around ~$3,800. That's an amazing price! That's less money than I paid for my car, and the audiobooks have greatly enriched my life in all sorts of ways.

[zeroonetwothree]

I do the same thing and have ~500 books so far. I started in 2014, so I buy around 100/year. The overall price is actually cheaper than buying paper/ebooks, considering I buy many new releases.

Also getting longer books is a really good value, since they cost the same. Just get Infinite Jest instead of 5 separate books.