So do I just use those up and then once I am done I start to see prices and am able to buy a la carte? Or once they are used do I need to buy outside the app?

I am down to my last few credits and it seems like if prices vary then I’d like to know that to decide what to use credits on and what to buy.

Probably dumb to not know how it works but I’ve always just stuck to hard copy books and only this year gave in and started mixing in audio books for when driving or working out.