itch.io

Far as I know the quality counterfeit passes are the only way, so try to save the trips to when you need to do a bunch of things (and have $5000 or more if possible, things aren't cheap!). I think the intent is "get a quality pass and do a bunch of things while there so you don't have to make repeated visits if possible"

The Junk hobo on the slums sells counterfeits that are 100 but aren't guaranteed to work, you unlock them buy giving a medium or better gift to the info hobo in the 5 credit slums rest spot. Then I just save scum the gate keeper till it works