In the UK, my experience is that I rarely notice these deals, but when I get to the counter with a single item, the person behind the counter points out the dea

In the UK, my experience is that I rarely notice these deals, but when I get to the counter with a single item, the person behind the counter points out the deal. I then have to make a decision of whether to go back hunting through the store for the second item, or forgo the saving. I almost always do the former, which is awkward if there's a queue of people behind me.