I ordered 25 medium size dubia and left them alone for a little so i could finish up my crickets..
When i finished them, i went to get my roaches to transfer them to a bigger tub.. and i saw a few little babies in the tank! So perfect because i was afraid the ones i had were too big.
i got my dubia from the roach cafe. they were really nice, even emailed me to make sure the roaches arrived safely.
i am sure you can make special requests. i would try there. or maybe talk to some of the people on the site that are breeding roaches.