You mention pololu, so I'm surprised you didn't find them there. They may not have the exact pre-made cables you are looking for, but they have the
connectors in many different pin configurations sold in small quantities, and they have pre-crimped
wires in M/M, F/F and M/F configurations in various lengths and colors. Pololu is my go-to place for this. You could probably do better pricewise - especially on the connectors - if you go to someone like digikey, but you'll be buying in large quantities.