Hikvision Dealers Who Buy Outside Of Sales?

The post on Hikvision's latest sale made me wonder, for dealers who buy stuff outside of the sale times, do you ever ask for (or receive) a retroactive discount when the next sale comes up?

In standard retail, it's fairly common that if an item goes on sale within 30 days of your purchase you can bring the receipt in and get the sale price. Do Hikvision distributors offer something similar for dealers with bad timing on their purchases?

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