Anyone know where to buy one. We don't have enough tropical plants to justify heating the hot room in the greenhouse even when we get it done, so thought it would be interesting this year to track the overnight lows inside to see how much protection the greenhouse gives. So DH and I moved the few tropicals onto the porch this morn along with the ornamentals that winter out there. Now I want to buy a minimum/maximum thermometer for the greenhouse. Preferably online as I am so far out in the boonies.