Also, if you have a budget in mind, or don’t know what the gamers wants that well, a bookstore or Amazon gift card is a great gift, to make the rulebook or other item cheaper for them at least. If it’s budgetary, just tell them with an accompanying note what it’s for, and that will personalize it so much more than a random gift card, because they then know you at least know them well enough to know what they like...