I found one via a Tegu forum that I contribute to. I am trading one of my three Tegu's for the Black Throat which is a 2.5-3' probable female. According to the owner, she is fairly tame. She seems to enjoy being stroked but tail whips when picked up, which is pretty normal for a juvenile lizard, monitor, or tegu. She has never bitten however.
My adult male Tegu, Gordo bit me lightly once. He wasn't being agressive at the time but more curious. It broke the skin a little but that was it. He has never given me a threat display or anything since that one time. My 9 month old female did the same.