I haven't seen one with a thermostat attached, but that doesn't mean they don't make any. I think it'd just be cheaper to buy them separate anyway from somewhere like www.reptilesupply.com. It will keep the air temps correct. Basically, (like at night when temps drop) the thermostat will only turn off the uth when it gets above the temp it's set for. Otherwise, the uth will remain on and keep the tank warm. If you're concerned about a day/night cycle, you can keep the lamps, but if it were me, I'd try to sell the lamps (like on e-bay) and just keep the tank close to a window. (It's what I do. Room lights up when the sun's out, gets dark after it goes down. Except when the room's light is on that is...but you get the idea.)

I don't have a huge tub, so one uth works for me (hot side is right and so long as the lid is closed most of the time the other side still stays above 80). Now, later if you get a 50 gal tank or something, you'll prob need two uth's to keep all the tank warm enough-but that's later...

Also, Keep the lid on the tank. Sounds simple, but a LOT of heat and humidity will rush out of a tank with the lid off. So, when you go to handle your bp, be sure to keep the lid on after they're out of the tank so you can keep the right levels.