Quoted from Mrbill:
a dedicated jr pac is extremely rare. Its going to cost you 3x-4x what a kit will cost you. So unless you like the look with the super size mappy type marquee, you might want to go for a kit. most kits are into super pac and pacman. Super pac uses a dc version of the pcb, the pac uses an ac version.
Its a good game, but I would recommend getting nice pac/ms pac. then buy mike doyles 96 in 1. then you can play all pacs and jr pac.
Where can you get the 96 in 1 kit? Would like to get one.