When I was buying soap, there was a pack that said buy three soaps and get one free. It seemed like a good deal to me, so I picked it up

I’ve worked in a shopping mall before and most times when we do sales like this, is because its a new product that the company wants to gain publicity…

but if it’s a popular product, it’s a clearance sales and I’ll suggest you check for the expiration date… so, you can use it quickly. This is what is applicable most times here.