Eagle in question is the son of a good friend. I'm not sure he could pick me out of a lineup. He's 18, about to graduate high school. I don't know very much about his interests, etc.
I'm a former scout, former scouter, but I haven't been to an eagle ceremony in at least 10 years ( and that one specifically said no gifts on the invite).
Of course, being me, it's this Sunday. I'll probably end up driving it over to the house, don't trust the postal service.
Best I've come up with is an Amazon gift card and a nice, heartfelt letter. In spite of the (B)SA going off the rails I still think it's a major accomplishment.