This is the only exotic pet insurance I can find (US). I'm not sure the monthly cost, I have not called them yet since I don't have my chameleon. Just thought I'd share the link for all those who want to look into it.
http://www.petinsurance.com/plans-and-coverage/bird-and-exotic-pet-insurance.aspx
http://www.petinsurance.com/plans-and-coverage/bird-and-exotic-pet-insurance.aspx