I bought 7 plastic jar keys as gifts from Kitchenniche.ca. I had one and found it be such a useful gadget for breaking the seal on jars, but couldn't find them in the stores again. Kitchenniche had them at such a great price and shipped them out right away. They were also good about keep me posted on the processing and shipping of my order.
Tip for consumers: Free shipping is for $100 orders only, but the shipping cost is very reasonable and their prices are already low.