OS Commerce Different Supplier Price Lists

We have a website that sells Land Rover parts using OSCommerce V2.3.1. We use mainly two suppliers, we have been using product attributes so we can have a drop down menu on the product to chose the supplier. (People have a preference to suppliers of Land Rover parts). The problem with this is that one of the prices is based of off the other and the prices from our suppliers change independently. So if the base one changes, the price of the other changes. The product attribute part of OSCommerce also seems really unintuitive to use and keep track of when dealing with as many products as we do, especially when the prices change on a month by month basis. What we would ideally want would be having one product entry with two independent prices attached to it. So we are asking for help on finding a solution or to find and implement a more manageable process for our different suppliers. In more clear terms what we want would be; A single product which has two prices attached. Due to the way we do the price changes (Easypopulate, swapping in excel spreadsheets) we would want both prices to be in separate tables/spreadsheets according to supplier. So we can easily change both prices. Thank you, Mark's Garage. [login to view URL]