Thinking of buying a oa vaporizer to treat with this fall. I have 2 questions I read you can buy oa from ebay or ace hardware, checking on both places, on ebay a 12 oz. pail is selling for $7-8 on the ace website it looks the same pail and says $125 is there haz. fees on shipping from ebay, or something I am missing? Also was wondering if oa does anything against shb ?