I've been doing constant missions and rotating through the store to hopefully get another book.... It's felt like 3 months since I've even seen a book within the mission store. I do currently have 2 books that I got from the mission store is that blocking one from appearing?
It takes eons for books to appear in the mission store, I swear. I always make sure I have plenty of credits ready to go in case a good one pops up.
Also the above is correct, you can only use each book once- however you can get the memories and mammaries book. This allows you to ‘repeat’ the last book you read, so basically reading the same book twice ;)
Heh its weird you never see what your looking for. Im using my credits for weapons mods and ive seen like seven or eight books since ive started doing that (but been waiting months for the right mod). Im sure if i decided to start purchasing books from the mission store i'd never see one again!