Great CS Plus via Amazon offers the Hamilton Beach Open Ease Automatic Jar Opener, model no. 76800, for $9.40 with free shipping. (Non-members can spend $35 to bag free shipping; otherwise, it adds $6.85.) That's the lowest total price we could find by $4. (Most merchants charge $20 or more.) It opens a wide variety of glass jars with lids from 1" to 4" in diameter. It requires two AA batteries (included).