• gtweb.net (also complete systems, see below)
  
• online-spectrum.com (also complete systems, see below).
  
• calpc.com
  
• Boomrack
  
• www.appro.com
  
• www.svecusa.com
  
• acerack
  
• amtrade
  
• Mapower (look nice but no clickable details)
  
• tesys (telenet systems) (nice but very pricey)
  
• www.cobaltnet.com
  
• Siliconrax-Sliger
  
• Rackmountland
  
• www.cidesign.com (nice looking but unfortunately no pricing given)

Sites which might be interesting but appear to require javascript or do not work for some other reason:

• Mitach
  
• www.aristaipc.com

Complete systems

• www.supermicro.com Have been happy with Supermicro motherboards;
  Doesn't sell direct, so no prices.
  
• gtweb.net (also cases only, see above)
  
• online-spectrum.com (also cases only, see above)
  
• www.fnordsystems.com
  
• www.rackable.com
  
• www.freebsdsystems.com (very nice looking but pricey)
  
• www.penguincomputing.com
  
• www.dcginc.com
  
• Gorilla.net
  
• googlegear.com (systems, servers, general equipment site)
  
• www.asacomputers.com (tended to crash my browser, so didn't explore much)
  
• www.californiadigital.com No pricing, "call for quote"

Racks and Enclosures

• www.iscdfw.com (good looking datacenter pricing)
  
• www.sharkrack.com
  
• www.jbmdata.com
  
• www.rackmountsolutions.net
  
• www.amcoengineering.com
  
• www.techniquesintl.com
  
• Cooper B-Line
  
• I-Tech Company -- rackmount Keyboards/LCD displays/KVMs
  
• RackmountMart.com