You cannot do that.
The good trusted thermostats are the herpstats, which are 100 for the cheap ones. They range at the moment to about just shy of 500 dollars, however they have ones that control 1, 2, 4, or 6 heat sources. So normally a herpstat 4 and 6 are going to be used to control a number of racks and/or incubators and are a savings compared to as many cheaper ones.
The reason you cannot do that is because thermostats are stupid, it's a great way to start a fire or underheat your reptile