OsCommerce Multi-Price Update Mod

My site, [login to view URL], contains a lot of products (currently around 500, including the variations it comes out to more than 1500). Since the price of gold changes frequently, I need to be able to update prices for all items and their variations on the fly. I assume a custom mod needs to be created, so I need someone who is a specialist at OsCommerce. I already have a custom calculator in which I input the price/gram and the weight of the item, and the calculator performs a series of steps which include the shipping and other values to arrive at the final price for an item. I would need that calculator to be integrated into the mod. So in essence, I will need to be able to implement the ability of this calculator to update all prices on the site at once. See the attached picture of how I envision this mod will look. Every item on my site belongs to a certain price category. I should be able to input whatever prices i need to and then when I press the Update button, the new prices will be ran through the calculator and propagated through the site. Here is the link to the calc: [login to view URL] Thanks