Funky,
I found a local aquaponics outfit that would sell small TP, fry, or for big bucks, some breeding pairs. That was too pricey for me so I ended up scouring Craigslist and found another aquaponics enthusiast who had some for me growing in his basement. The next spring he lost interest in aquaponics and moved to a smaller house to he couldn't supply me anymore. Check CL.

Also you can buy on ebay. You want blue TP.

I hope someday a fish hauler from a nearby state will navigate the permit process and be able to truck them in to SW and SE MI.

They are allowed in MI (or I should say they are not on the 'not allowed' list) but things get a little murky if your pond has an inlet or outlet to existing waterways which mine does not.