Will your insurance company cover them for you? If you got the unit from a W.C. claim then the insurer should be paying for them. I used to get an order form in the mail every month for what supplies I needed from the company and they just billed the W.C. insurer. On my stim pads, I have to purchase them directly from the company and then remit the bill to the insurer. It only took about two weeks to get a check from them. Just some ideas.