Hello. I have a caramel corn snake, and I want to get a proportional thermostat for her to maintain temp of the enclosure.

Most people seem to recommend an expensive thermostat that's at least 100$ US, such as a herpstat, vivarium electronics, helix, etc.. But a lot of them seem to be either breeders, or people with multiple reptiles.

My question is, how reasonable is it to get something like a herpstat, just for 1 reptile? I still would like a proportional thermostat but I am wondering if there is any that are cheaper. Also, if anyone has had a cheaper proportional thermostat that is of good quality and lasts a long time which you would like to recommend, please do

Any answers greatly appreciated.