A helix thermostat, a herpstat, or vivarium electronics are all decent brands that can run more than one heat mat at a time. You only use a single probe, and the thermostat will run all the mats based on that one probe (so you'll want to make sure you've got the same type of animal in those tubs together). I use a VE-200 for my two ball pythons. I have the probe under my regular BP's cage, but both mats are run at the set temp.
Helix: http://helixcontrols.com/
Herpstat: http://www.spyderrobotics.com/index....=index&cPath=1
VE: http://www.vivariumelectronics.com/
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