[SEDXC] 19" Rack Mounted Enclosures for DX Cluster Equip?

[Ernie KS4Q]

Guys,

I am looking for a totally enclosed  equipment enclosure that can me mounted
in an existing 19" rack. This is needed to mount some packet cluster
equipment in at the site at Sawnee Mtn. Ideally it would be five or six
inches tall and 18 inces or so in depth, and of course around 19" wide.  The
idea here is to provide RF shielding.

I'm not looking for a tray or a shelf.  Its OK if there are guts still in
the box that can be removed to make space for equipment. Ideally, there
would be ventillation slots or holes cut in the enclosure to allow heat to
escape though this is not absolutely necessary...We can always mount a fan
on it to suck out the heat.

Anyone got anything that can be had for free or cheap?

Thanks, Ernie KS4Q