Meritline offers the Acu-Rite Outdoor Digital Window Thermometer, model no. 00603A1, for $11.99. Coupon code "MLCKW16ZNL1" drops it to $8.99. With free shipping, that's tied with last summer's mention as the lowest total price we could find by $3. This indoor/outdoor window thermometer records minimum and maximum outdoor temperatures. It includes a CR2032 battery. Coupon expires after 100 uses.