I do believe there are some - I saw some at PRAS a couple of years ago. Dean Rudman I think was the chap who was selling them iirc. You could also try Mujichameleonworld or Chameleoco. You could also look on two UK forums (if you aren't already a member) FUK and Captivebred.
Il be looking for some quads in the future so if you find some please let me know and I will do the same for you.
I know someone who owns a single male but they don't want to sell.