Help with front sights

[just for fun]

My son has made what seemed to be an easy to fill Christmas request. A front sight that clips on the barrel of his shotgun and looks like a pair of glasses! He is just getting started in skeet shooting and wants this type of front sight to learn lead. At one time this type of sight was sold everywhere, now that I want a set-can't find them. Does anyone know of a source for these sights?