Why not have a /teamshoppinggal Just make a base similar to HQ and team outpost. Whatever gal that base is in for the team, that's what comes up on the list as they're shopping gal. You could also have it list how many bases are in that gal. In the case of having 'too many' names on the list. Simply rather than having it alphabetized make it so it lists in order of team score so the more recognized teams shopping gals are more visible. it would save a lot of time asking around on all chat and looking on trade forum for a particular teams shop.

How would you stop spamming?

Already some different ideas to assist in team shops as well as shops in general however I think this goes a bit in the wrong direction though.