ESP’s

I am consulting for a start up company that will be selling manufacturer direct name brand clothing using a distributor network similar to “Mary Kay” or Tupperware.
the concept is to collect data on members and buy discounted lines when a critical mass is reached.
At this stage the network will be used to collect customer data, advertise and market.
I need advice on an extranet solution for a small company, 10-15 distributors, as most ESP’s cater to mega corps.
Thanks