The connectors are Molex 08-52-0072, available from Great Plains, BigDaddy, Mouser, etc..
I buy them in sets of 300+, you get decent discounts for buying in bulk.
http://www.greatplainselectronics.com/search.asp?pg=1&stext=08-52-0072&sprice=&stype=&scat=
http://www.bigdaddy-enterprises.com/ (look at connectors CONN-156B)
http://www.mouser.com/ProductDetail/Molex/08-52-0072/?qs=%2fha2pyFadujVG84b3AqCcnclSMMGw03waBtq4v%252bcATQ%3d
I use the Waldom tool "Molex HT-1921 Crimper Tool" available for approx $18