If I wanted to make a standard opening order of $200 worth of product, how would I do that?

I sell wholesale and the products I sell are CDs. We want our customers' first order to be $200 minimum with re-order minimums to be $100. Within those parameters, the customer can choose any combination of products we sell (as long as the total order is $200) but there is a minimum of 2 items for any particular CD.

Is this at all possible?

Thanks in advance for your help!