Here is one slightly cheaper that should work.
https://www.gqfmfg.com/store/comersu...p?idProduct=74

This is the more modern version of the one used by Ballroom pythons South. He uses the 1250R which you can still get if you call and specifically ask for it. I think with shipping the 1250R costs around $450.00 if memory serves me right. After that though you will need to get a wired Ranco as the 1250R has two wafer type thermostats only. You use the wired ranco as a fail safe to the wafer elements by setting it at 91 degrees and then the wafer elements to 89 degree on primary and 88 on secondary. I replaced all the wafer type thermostats in mine with 2 Rancos and then added a third as additional back up. The Rancos can get pretty expensive doing it that way and you kinda have to know what you are doing to wire all three up to work like they should.