Amazon offers the Cooper-Atkins 2560 Digital Refrigerator/Freezer Thermometer for $13.25. Clip the 75-cent off coupon on the product page to cut it to $12.50. Pus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.01.) That's the lowest total price we could find by $11. It measures temperature from -22 to +122 degrees F and features a high/low temperature memory.