a VirtualTourist member from Houston
Are there any near Kaihin makuhari?
There is a 7-11 nearby. While i don't know for sure, i'd bet there's a 100Y shop somewhere nearby.
There's one inside the Plena Makuhari building (2-4 Hibino, Mihama Ward, Chiba), which is right next to Kaihin Makuhari station.