ThermoWorks Black Friday Sale! ThermoWorks Black Friday Sale has begun. The Thermapen Mk4 (Mark 4) [First Looks] is marked down to just $79.20 (that’s the best price we’ve ever seen). The great Classic Thermapen [Review] is just $69, the ChefAlarm Thermometer/Timer Combo [Review] is $49, the RT600C [Review] is just $16 and lots more. ThermoWorks Black Friday Sale!