Don't use automated incubators for bird eggs as they turn the eggs and that will kill reptile eggs (they must be kept the same way up otherwise the embryo will drown).
You can make one with a polystyrene box, a heat mat and a mat stat or buy a ready made one. I've even seen people use broken fridges with statted heaters on them.
As for temps it depends entirely on the species of snake.
Cheers
Andy
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