I believe that if a certified technician evacuates it, they can then resell it. To have a chemical waste company come and dispose of it(which they burn it anyways) would be pretty pricey...dependent on how much you have. I can't tell you exact prices. A company called RemTec international will buy (only certain mixes), or take used freon off your hands. They clean it for reuse or destroy it if it is dirty with no cost to the customer. Downfall here is, you must be a certified technician to resell like this because you have to keep the same kind records that the company you sell too does.