Hello, I have a masterbuilt electric smoker and the thermostat control readout is all messed up it will only read up to 99 degrees and needs replaced. Its an old model I have had for years and the replacement part is so much I might as well buy a new smoker. Anyway, what would be the cheapest thermostat I can use. I don't need timers ect I just need it to keep at the correct temp. Thanks!