I’m not surprised you’re looking everywhere and coming up a little short. Even though Goblins are always underfoot, they’re still easily overlooked.
Seriously though, hang out in the Valley of Honor. Any of the market events, especially the Gilded Market. It was founded by a goblin and several goblin run (but not goblin exclusive) businesses operate out of it: The Oyster Business, The Wonderporium, Frostbite Contingent, Gearpunk Dynamics, and of course, the wonderful Firebrand Enterprises!
And I’m sure I’m still missing some. Goblins are everywhere!