Its tough to say. I can tell you over 100 back patches sold on Thursday in a 24 hour period. Boots usually stocks over 100 of each now and the max you can have in shopping cart is 99. So I can only start tracking then. There were 93 on Friday morning and today there is 6 back patches left. they restock quickly so I have to refresh my order often to keep tabs. The knee product was going good on Thursday also and they reloaded midday with a big order. All three have at least quadrupled in daily sales in recent weeks. Boots sells more than Amazon but Amazon is gaining traction also. The back patch is climbing the alternative category daily. Its number one in magnetic cat.
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