Mark Seifter Designer |
Bellona |
I'd consider looking at both Ultimate Intrigue and Black Markets (in the Golarion-based Player Companion line) for helpful/interesting ideas.
There are two other Golarion sourcebooks coming out soon-ish: Inner Sea Intrigue in May (Campaign Setting line) and Spymaster's Handbook in June (Player Companion line). Granted, the last two are currently an unknown quality and might also be more vigilante/intrigue based than a smuggling campaign needs.