Coin book storage question-- where does one find storage devices/bookcases?

Longacre

I am building quite an accumulation of coin books and other coin-related materials (current and old auction catalogs, etc.). Right now they tend to be piled next to my desk in my office at home (along with the treadmill that I never use, although its flat surface would make a nice support for new piles of books). Does anyone know where I can find reasonably priced bookcases (nothing fancy) or any other storage device? Hopefully this question is coin-related enough so it does not disappear from the forum.