I sell adult male dubia for $.10 each locally (craigslist)... and if I don't have enough males when someone gets a hold of me, I do whatever big nymphs I have for pretty much that same price.
I don't like sorting all the little ones out, so I don't sell too many of those.
Like Doc said... its not that great of a deal. There's probably little guys with a few roaches here and there that will cut you a better deal... it's just finding someone local. Or order from Doc. Support your local hobbyist.