I've found Brown Treesnake eggs to be extremely easy to hatch in a range of temperatures and moistures. They'd hatch in a bucket of water in the fridge or on a hot, dry windowsill (okay, maybe I'm exaggerating just a little), but I've found the babies to be little horrors to get feeding reliably on mice.
I don't know why people say they're difficult to incubate. I've deliberately experimented with stupid conditions and they still hatch. They're very thick shelled and the easiest of all snake eggs I've worked with.