Need a File Drawer recommendation

[Kaido]

I've been reading up on this Getting Things Done thing and I'd like to give it a try. The author recommends using a 2-drawer filing cabinet as the basis of the paper system, one that is designed to work with letter-sized manila envelopes (not a hanging file or Pentax-compatible system). However, these are near-impossible to find. The closest I've found so far is a 4-drawer cabinet, but that's too large to build a desk on top of. I figured someone would know where to find one. I'm looking for a good-quality model, not a cheap piece of junk that's going to dent easy and fall apart.