To Joseph if someone buys a box of Kleenex tissues unexpectedly than you give tzedakkah of all the profit you made. To iacisrmma by second suggestion was for Fulfillment by Amazon should you have your own website you do what B&H does by closing the checkout page for Shabbos. The way Amazon works customers see a cheap price they purchase the item as long as the seller has a good rating & sellers on Amazon cannot get a rating unless someone purchases an item.
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