I bought several of these metal storage cabinets on ebay (new, $35 plus shipping), and they are fantastic. The cubbies are 4"x4", and I divided most of them into 4 using clear plastic 2x2 square tubing that I'd already purchased).
http://cgi.ebay.com/32-Hole-Metal-St...QQcmdZViewItem
Tubing from JC Danzek
http://www.jcdanczak.com/our_products/cat_7.html
--Gail
9/6/06 The above link doesn't work anymore, but it is Barnes Distribution on Ebay