It's not good to offer book store gift certificate to an 18 year-old when all they need is a better hoodie.
Each year my wife and I send our little ones who live of state gift cards - which we like to sending - and they love obtaining. Last, set a diary for cashing our your suggestions. https://Groups.google.com/g/giftcard-mall-my-gift-info/c/lJb4jNQqwjY