Ashopone via eBay offers this Stainless Steel Beer Bottle Opener Ring
in Black for 99 cents
with free shipping
. That's tied with our our mention from a week ago and the lowest total price we could find by $2, outside of the prices below. It has a diameter of 23mm and opens beer bottles.
A close price: Lucky Electronics via Amazon charges $1.15 with free shipping and Crazy-Store via Amazon charges $1.20 with free shipping.
Of note, all of these deals ship from Hong Kong and may take several weeks to arrive.