Cnc electronics

http://hobbymilling.com/ DIY info, couplings etc .. http://www.emakershop.com/printed-flexible-beam-coupling beam couplers connects stepper to acme threaded rod.

http://buildyourcnc.com/

http://www.wantmotor.com from  http://www.buildlog.net/forum/viewtopic.php?f=16&t=1769 major supplier of stepper motors

http://www.makeblock.cc/

= links = http://reprap.org/wiki/Extruded_Aluminum

http://www.pdjinc.com/parts.html Nema 24 steppers $56