The Porters do come up with some beautiful colors... I believe most of them breed true, so what is wrong with naming his varieties? Even varieties like the Narrigansett and Bourbon Red started as wild turkeys. If you look at the American Poultry Association, Jersey Buff and Sweetgrass aren't even listed. The recognized varieties of turkeys are: Bronze, Narragansett, White Holland, Black, Slate, Bourbon Red, Beltsville Small White, Royal Palm. But if anyone could get their hands on some Nebraskans (pretty much believed to be extinct), you could make a lot of money off of the poults since there is a pretty high interest in them.
All that being said, I live in a rural area and am lucky if folks will pay $25 for an adult turkey. I had adult ducks listed for $5 each to thin down the flock once, and someone called thinking that for $5 they could get a dressed and delivered duck. Not likely!
My advice is to factor in the cost of the poults and how much you put into raising them and decide what you think is a fair price (and what you would be willing to pay). If they don't sell fast enough, you can always come down. I usually pad the price a little so that I can be 'talked down' a bit... everyone likes to get a bargain and some folks just pay the asking price and you get a little extra.