I saw this kind of behavior in many places.

We had a LIDL discount store on the other side of the road in my old location. One day they offered a top-of-the-pop GFX card (25 years ago!) for an incredibly low price. Before opening times, there was a queue from the door across the parking lot to the street. I was there when the shop opened (not in the queue, just on the way to my car), and people stormed in. I saw people jumping over the checkouts to bypass the crowd. Later that day, I talked with a cashier. They had had serious problems that morning, because their allotment had been a total of three cards.

Many years later, a superstore offered a high-priced LEGO set for a dead cheap price. So I was there when the doors opened, ran towards the toy aisle, grabbed one of the two sets on display. I thought for a moment to buy the other one, too, but some other guy just took it. At the checkout I asked if they maybe had another one in stock, but they admitted they only had gotten those two sets.