There are other makers like Sophiecabra, Essorille, Limeythecheetah and so on. You send them e-mail with what you want, they e-mail you back with how much it would cost. You can also make one yourself. As far as I know white one was made by the person wearing it.
Bronycars and Canni were made by Atalon. You simply send him an e-mail (atalondeer@anthrocreations.com) and ask if he can make one for you.