This one I’ve actually used a few times & it’s worked. Be sure to check the additional fees after the deal; sometimes that can drive the price higher than you were initially hoping. Also, there’s a level system; you get better deals if you’ve actually used the app before.
Serial Reader | Classic Books in Daily Bits for iOS and Android
I've been reading Moby Dick for years with this app, lol. No but I do really love it. I'm actually almost done with Moby Dick. This app doesn't sync between phones very well ime.