I wonder if this happen while using Costco Travel or AmEx travel etc.? What about travel agents? Do they also get price discriminated against depending on wher

I wonder if this happen while using Costco Travel or AmEx travel etc.? What about travel agents? Do they also get price discriminated against depending on where they are? This can lead to startup ideas as in book-from service which scans all the zip codes and helps book from the cheapest one.