One of my lfs normally have Ameca splendens ive thought about getting them a few times but never have. Are you sure they would be ok with temps that low? Most places say 20-21 minimum temp.
After suggesting them I'm now struggling to see many places suggest temps lower than 20C myself...
I'll carry on trawling and see if I can come up with anything more on coping with a seasonal low of 15C. I believe "nmonks" has a breeding group, perhaps give him a PM?