it's not that easy to answer, as there might be difference what constitutes the edge of the bubble.
- i personally look at closest industrial orbital station with shipyrad, that would be HIP 78136 , Atese or Bodhinga.
- if you are just looking at orbital stations with shipyards, that would be Pratchetts Disc and Quince.
- if you count in the "outposts"/asteroid stations, that would be Mammon or HIP 83506.
as for passenger missions, i know of no better way to fly between stations and collect some -service and tourism economy can help with that (i used to take them from sol).
Quince as above is tourism economy, and
HIP 83701 at the edge of the bubble.
how did i create this list?
- i looked up sag a*s galactic coordinate.
- i used spansh search for closest known system to get the system 1000 ly from sol to sag a.
- i put in that system to eddb
caveat: the bubble is no ball around sol.