Is this something I just need to search the galaxy for, or is it listed somewhere? Is there a 'hint' on knowing where to find these in the sectors? Are there some in every sector? I'm look'en to buy facilities from the NPC market, I'm in Orus, where do I go (this is the 'lazy' question)?
There is a thread about this in the Traders Lounge containing a list of public trading stations and commerce centres. However, the list is not officially part of the Combine, so if you have questions about it, you need to ask the creators of it, or post in their thread.