I'll usually see a shirt or something that I really like on every trip. I typically won't buy it right away, but I'll notice it in every shop during the trip. Usually I cave on the last day and buy it. Sometimes I wait and end up buying it the next time.
Recently I've started buying my wife a candle that I bring home when I'm on a solo trip. I like this IASW one that I got recently:
View attachment 1056460