Depending on where you buy from, its about $2 per single connector. However, you are in luck:
http://www.offshoreelectrics.com/pro...od=dh-gpmm3115
$1.89 for 3 female 4mm connectors which you need for the motor. Now the hard part- if the motor does have 6 poles sticking out the back, 3 of them you solder the wires to with the plug on the end, and the other 3 have to be joined to the first 3 poles like in the .pdf diagram using short lengths of wire- you should get a diagram with the motor, or you can always ask FD if they can do it for you; cant hurt to ask to save you some hassle. But if any of that sounds like too much, I would say look around abit more for a neu motor and just gear it down so that cogging isnt an issue with the MM, I sure some of the guys who ru this combo can recommend some programming settings that will help also.