Does anyone know of a way in ZC that I can offer my products and their availability by a range of zipcodes based on the address for a registered user? I'd require all visitors to register before they could shop. Upon registration, they will only be able to purchase the products available (not already purchased) in that zipcode range. each product will have a stock quantity of 1 within this range. once someone in this zipcode range orders the product it will be unavailable to any other registered user in that zipcode range.

I'm basically wanting to sell my 10 items to X# of US regions which are based on a zipcode array. My customer will be the only owner of that product within each US Region.

Any ideas or am I looking at hard coding the ZC engine?