[sritch]

I think one of the most important things you need to handle is the empty results page. Don't have your users reaching a dead-end, especially right now since you have a small user-base. You should continue the experience for the user, possibly by providing them with a link to where they can buy it themselves (be it on Amazon or Chegg) and maybe throw in an affiliate link if you're set on earning money.

[okhudeira]

I have the code that pulls up Amazon pricing/links commented out. I initially had it for the exact reason you mentioned (to avoid dead ends) but figured it might give users a bad impression of the website, after all, BookTurf is supposed to be an alternative to Amazon (and the book store).

Edit: spelling