What do you do when you see pellets advertised at 1/2 price?

I saw this advertisement for H&N Baracuda 18 for the equivalent of $3.50 for a tin of 200. I thought it was a typo or they had only 1 in stock and use it to get your attention and then offer you something else. So I first ignored it. Two days on and I thought, just phone and find out what is the situation. So I phoned. The salesman answering the phone was not sure about it himself and checked. Sure, that was the advertised price and they had 41 tins in stock. Actually 42 but one tin was damaged. So I ordered all of them. That is way below the normal list price and that is my PCP's best shooting pellet. That will keep me shooting for a while.