Finding the Golemworks is not tricky. The tricky part is getting them talk to you. First thing their clerk does after looking at you is to say that the golems are expensive, so if you don't know better and want to see the catalog, please do so and decide if, after that, you still have any questions. The catalog lists all types of golems the factory makes, and some types of golems the factory does not make, marking which one is which and what price is the former. Many golems, notably those with entries containing the most impressive art and text, have the price listed as "arranged individually", which you translate roughly as "helluva lot". You also see that they make other types of constructs, but those are also expensive, even if not as expensive as the golems.

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Diplomacy DC 20 if you are not into a golem-buying business and want them to talk. Or spend some time with the catalog to identify golems at +10.