I went to domestic supply and the Testosterone Enanthate 1 vial 10ml 250mg/ml by Zhengzhou Pharmaceuticals Co., Ltd. is priced at $75. But then if you go to zphcstore.com the company's website, they sell the same exact product for $40. They both use the same shipping and payment tactics but the brand site has moneygram and paypal as an option. Why is that store not on the approved sources page and why is it almost double is cost?