MOTM

First off, they're telco style racks, not server racks.  Server
racks are typically four post and/or enclosed.  A good enclosed
36" deep server rack runs about $1100.  A cheap bolt together
telco style rack is about $100.  Possibilities include:

Chatsworth - http://www.chatsworth.com/catalog/page15.asp
B-Line - http://www.bline.com/product/BLT98/SRR_1AL_Racks01.htm
Newton - http://www.newtoninst.com

The Chatsworth racks aren't near the quality of B-Line or Newton,
but they have 10/32 threaded rails and are more than sturdy enough
for lightweight MOTM use.  B-Line and Newton make unequal flange
racks with deeper channels that would make for a nice MOTM rack,
but they are _HEAVY_.  Try your local Graybar for availability.

-Cary