I make my own "pwm" cables. It's usually a lot cheaper, and you can make them to the correct lengths. You can also make super cheap RS-232 cables.
Wire:
http://www.elexp.com/cbl_22rd.htm
Crimp Terminals:
http://www.elexp.com/con_4fcp.htm
Terminal Housing:
http://www.elexp.com/con_0303.htm
Buying from the above supplier, a 3' cable would cost about $1.43, which is pretty cheap :-)