Dbordello,
Sorry about how long this is...
Check out
http://www.durhammfg.com/catalog.html?id=44 (manufacturer listing for this product line) -- I know they sell to Fastenal painted blue or you can find decent deals from industrial supply houses like GlobalIndustrial.com or CHDist.com -- I've never bought from zoro.com. After you figure out the model numbers you might like, google to find deals if buying new.
FWIW, I have a bunch of Durham "Large Compartment Boxes" that I bought new and even more used Durham and Bowman units off Craigslist. If you are buying new and will have a ton of weight in them, consider the "newer" versions that have the better slides; also consider the slightly taller cabinets (15"H), as the box lids will get bowed over time by apes, then don't fit or if you forget to latch them, they jam. I mounted two 5' stacks on a caster cart (like a movers dolly), back to back, and it works well. Lesson learned, don't put them above eye level, as you end up pulling them down to get anything -- haven't tipped the stacks (yet) as you have to open the box lids, so it isn't like a filing cabinet where you might pull all the drawers out at once.
I use the "horizontal adjustable" 099-95's for chainsaw chains, they don't shatter in the cold and keep my chains sorted by length and sharpness. I have a couple 109-95's that have the large section on the right and 20 little compartments for some electrical crimps and leave a crimper in the box, but most of mine are 111-95 (20 compartments) or 102-95 (24 compartments) for sorting out hardware. I have found 107-95 (32 compartments) to be a PITA because I can't get single pieces out with my fat fingers and **** ends up migrating into other compartments -- however, 113-95 (16 compartments) are almost too big for most things. "Vertical adjustable" 119-95's aren't bad, but they lose the radius at the bottom which helps my fat paws pull things out of compartments and thin stuff slides under the dividers when you pull the drawers out.
Global sells "ala carte" but makes you buy in case quantities -- I'd go with C&H , also selling ala carte but lets you buy singles:
http://www.chdist.com/interactive-catalog/?p=0185
The zoro packages might be a deal, especially if shipping is included -- best bet initially would be order a single
http://www.zoro.com/i/G3164673/?category=5614 because it has a mix of compartments so you figure out what you like.
Good luck!
Mike