What do you get a dad who says he doesn't want anything?

Dads who say they don't want anything usually mean they don't want clutter. Focus on consumable upgrades or replacements for things they already own. A better phone stand for their nightstand, a new set of oven mitts for grilling season, or a portable charger for travel are all things that improve daily life without adding stuff to the house. The key is replacing something worn out with something noticeably better.