Before I figured out my book storage solution, I researched a lot, first because I spend enough money with books, I really didn't want to go broke on bookshelfs.
This first post is going to be bookshelfs that are readily available and you just have to put them together.
1st is Walmart, do I need to say anything else?
They even came in a set of two!
2nd is Target, I love Tarjay, I can get pretty much anything there. Their stuff usually has good quality and decent prices.
Ikea furniture is also very easy to find on Craigslist or Garage sales, the prices are usually great.
Oh, also dont forget to check their sale section, always have good deals.