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http://www.shopxscargo.com/product_c...gory=Bookcases
They're 29.99, but you'll get more space in total that way than if you did what I did & buy a pair of the 3-tier to stack on top of each other. Plus, it says that a couple of its shelves are meant to be adjustable, so for 30 bucks its probably the cheapest you'll find.
If you wanna look at others, just type "bookshelf" or "shelf" into the search bar and a bunch should come up.
