Servers /nodes

http://amadisystems.com/
supermicro

http://www.serversdirect.com/
supermicro / serversdirect

http://www.stikc.com/
dell

 http://www.servermonkey.com
dell / hp / others

refurbished

http://www.xbyte.com/
dell

http://www.dell.com/uk/dfb/p/servers
dell

http://www.dfsdirectsales.com/
dell

rack configurators

http://rackbuilder.chiefmfg.com/