Hit: Japanese Soft Drinks called Ramune that has the marble in them.
I bought 24 (two 12-packs) of Ramune for my DS15. His siblings keep drinking them too so there are only a few left. It's a novelty thing so not sure I would buy more as they are expensive for a soft drink, but they enjoyed trying the different flavors. I did google and see World Market carries them and they are currently building a World Market in a nearby shopping center so I might pick up a few when I go shopping there, but wouldn't order online again.
Misses: None as I didn't buy filler gifts.