I'm looking for one of the probe thermometer/hygrometers that everyone has pictured inside their bators, and that I remember my dad buying for his grill. Can't find them, and when I do they're like $30. Where is everyone getting theirs??? I found some at Petsmart, but they're just little dial stick ons and I don't know how accurate they are. Please help me out! I'm building next weekend and I want to start finding my supplies!!! Also, I can't find water wigglers....are they 100% necessary???