I have to set up membership where the member have to pay

I have to set up membership where the member have to pay for a national membership but the also have to pick Region and Affiliate choices and that adds up to the membership prices.

I had a developer working on that http://abc.djstechnologies.com/subscriptions/ but it's not working correctly.

How can I get that done, can I hire someone from WPMU to do that for me?