I haven't kept them myself but i am quite into geckos to assert the following facts:
-Naultinus live on top of certain trees,i.e. mostly on NZ cypresses species,with which they seem to be closely dependent.Naultinus breeders sell these small trees a fortune ,as you won't find them at your local garden shop :lol:
-They both require a high humidity level and a strong air flow to simulate the wind on top of the trees;2 opposed AC vents on the viv lateral pannels are generally used,but the balance between high hygrometry and air flow drying up the viv is really hard to achieve.
-They need absolute low temps:nothing above 80°F.90-95°F would kill them very quickly.
So this is definitely a species you don't buy because it's "nice" "pretty" or "fashionable",but,as it was pointed out earlier in this thread,when you have enough skill to keep and breed these endangered geckos.Someone who would have bred successfully Hoplodactylus,Uroplatus or Phyllurus species could try,but I will strongly go against the fact of them being in the hands of a non-specialist.
More,I know people who have some specimens.Prices you found are generally not even useful.Most individuals are under an exchange system between breeders who already keep them.If you are not from this very private circle,good luck! :lol: