Calculating Depreciation of Idle Tire Inventory

Hi everyone,
I have been put in charge and tasked with the challenge of clearing out our idle tire inventory, this inventory consists of, small, medium, and large passenger car, cuv, & suv tires, along with truck tires, and lifted truck tires (from 33-38 x 12.5-14.5 R 17-20LT). A lot of our inventory has been sitting idle for longer then a year, I have only been hear for 3 months, and at the moment, I am trying to return as much as my national account tire supplier will say yes too, along with my non-national account tire supplier (two separate local companies). Along with that, I am trying to sell as many as is take offs to a local buyer as they say yes to, and for the most part, it seems to be working in the GP $$$ sense, I am in the process of contacting another potential local buyer that buys used tires, to further rid myself of my idle inventory, so I would like to know what formula I can use to show them what is a good price to sell at, also, the tire inventory is hell on earth, non are received into the dms since the dinosaurs roamed the earth with adam and eve riding them like horses, they are all stacked with no thought or organization, they are contained to a steel shipping container in the back lot, and it Is more then difficult to reach some of them without first getting your workout. On a hot day, it is a sauna at best. Also if anyone is in the GTA, ask for info if you are interested in some "as cheap as I can go" tires. We also have rims, but that is a different story.
I have been put in charge and tasked with the challenge of clearing out our idle tire inventory, this inventory consists of, small, medium, and large passenger car, cuv, & suv tires, along with truck tires, and lifted truck tires (from 33-38 x 12.5-14.5 R 17-20LT). A lot of our inventory has been sitting idle for longer then a year, I have only been hear for 3 months, and at the moment, I am trying to return as much as my national account tire supplier will say yes too, along with my non-national account tire supplier (two separate local companies). Along with that, I am trying to sell as many as is take offs to a local buyer as they say yes to, and for the most part, it seems to be working in the GP $$$ sense, I am in the process of contacting another potential local buyer that buys used tires, to further rid myself of my idle inventory, so I would like to know what formula I can use to show them what is a good price to sell at, also, the tire inventory is hell on earth, non are received into the dms since the dinosaurs roamed the earth with adam and eve riding them like horses, they are all stacked with no thought or organization, they are contained to a steel shipping container in the back lot, and it Is more then difficult to reach some of them without first getting your workout. On a hot day, it is a sauna at best. Also if anyone is in the GTA, ask for info if you are interested in some "as cheap as I can go" tires. We also have rims, but that is a different story.