I've got two 4-space racks.
One is a shallow SKB hard plastic rack (I've mounted an Ashdown MK-500, an EA iAmp 800, and a Thunderfunk TF-550B it it; it's deep enough). It's got a couple of trim spaces on it that I had to make to rout cables on some previously owned amp. See here -
The other is a Grundorf rack that is a little wooly and has seen some gig time, but is top quality, tour-worthy, and pretty heavy.
I need a 2 space rack.
I'll trade even for the SKB, we each pay our own shipping. Neither the Thunderfunk amp nor my feet are included.
I'll trade for $20 my way on the Grundorf to keep me somewhat whole on the shipping for that beast.