License Question

Do you have to spend $2,000 for your first Prizm server with 10 elements or can you start out smaller? Right now I have 1 900AP, 1 2400AP and 2 5700BH links which is 4 elements. I believe that somewhere in some of the pricing I have been quoted that you can buy single element licenses for Prizim but it’s not clear if you have to spend the first $2,000 or if that is just a “bulk” pricing on 10 elements.