You guys in the US are probably awash with low cost workshop cabinet systems, but not so over here in Ireland - but just in case here's an option for tool storage.
I'm fitting out my workshop which includes an Incra router table on their longer support frame, and i don't have a week to spare to build fancy storage cabinets. This multi drawer steel cabinet in red by Ikea is cheap at about $39, and with the castors off is a very nice fit under a large-ish router table - depending on the layout it may even be possible to get in two side by side with a dust box.
http://www.ikea.com/us/en/catalog/products/40107872/
It's not heavy duty as such, but seems robust enough to do a good job of storing router tooling and related bits and pieces. I'm going to line the bottoms of the drawers with 25mm polyethylene packaging foam which can be drilled and cut easily with a knife to make sockets to hold e.g. cutters, and which doesn't stain.
It could be wall mounted too for other uses.
Here's another larger cabinet in a similar style, although I've not yet found a use for it.
http://www.ikea.com/us/en/catalog/products/80100190/
ian