I have so many ideas ??
1- headphones!! and if you wanna spend more money on it then get him a beats one ??it's a bit expensive tho .. but he's worth
2- if he likes hot drinks .. u can get him a coffe machine or something He'll remember you every time he uses it ❤️
3- make him a set of gym stuff.. like .. his fav perfume and some deodorant ? with a gym bag and some cool addidas socks & a water bottle ?
4- you can go shopping for some Tshirts/shoes/watches...basic things like that but ask him about his size indirectly
5- buy a 2 set of keychains for both of you ? or like matching hats/phone cover
That's all I have for now ??