I recommend either Spyder Robotic's Herpstat.
or
Reptile Basics Vivarium series thermostats.
Both companies build their thermostats specifically for use with reptiles and stand by their products with excellent customer service.
Unfortunately reptile thermostats are a specialty item and are not typically found at local stores. If you are determined to avoid ordering one online you could check out a local reptile expo, which sometimes have them for sale.
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