I am in the process of creating a WordPress e-commerce website but am having trouble with a feature that i require. I know that in the E-Commerce Plugin you can do tiered pricing systems/discounts for quantity, but i need the following:
Each product is in fact a SHIPMENT and for every additional purchase within that shipment, the individual item price decreases. So, Person 1 purchases item at $100. Person 2 however now only has to pay $95 dollars for that same item because P1 already purchased. HOWEVER P1 needs his $5 refunded.
P3 then purchases that same item at $90 because of the initial 2 order, but P1 and P2 need their excess refunded.
Is there an existing plugin/feature that provides this ability?