Not sure of GATG numbers, but the great pinball bar Shorties in Seattle is listing one in their current rotation - replaced a Baby Pac-Man - so there is atleast one out there still eating quarters.

I not only am a big Baby fan but own one. Vid board can be a problem - mine was warped when I got it and no after-market plug-in replacement available, it eats bulbs for some reason and the playfield underside is seriously crammed full = never work on hot. The only other quick recommendation is even with the short playfield, play is dramatically screwed if the machine is not dead level. I expect you will find all this also true with GATG.

Good luck!