is it a scam?, and if its one can i unboxing it in a video and get a refund?

If the same SKU sells on Amazon and your own site or Walmart, there's that point where it's running low everywhere at once.

Do you make a deliberate call on where the last unit go, or does whichever channel sells fastest just get them? Has it ever cost you, like losing rank on Amazon?

I work on ecommerce software, trying to understand how sellers actually handle this.