Let me clarify. When I said I'm going to buy it anyway I didn't necessarily mean at that time. There are many things that are in the "do not need to go out and buy it now but I do need to buy it in the near future" category.

I would normally get those at the store I normally buy that kind of thing when I'm there to get other things. E.g., most groceries come from the big Walmart Supercenter near my house. If I get a flyer in the mail from the Safeway that is on the other side of town, and see they have a good sale price on one of those things, I might stop by that Safeway when I'm in that part of town on other business and get it.

just get a list of shops and compare their prices instead of waiting for an ad popping up in front of you for each product you buy when you actually would prefer to watch something else?