I have bought them and had them grow for me, but not always.
I suspect they have been treated with a non sprout chemical, as they do with sweet potatoes.
Or some of them are so old that they do not have the strength left to grow.
If it came in a little box, then the odds are it was too old.
Watch for the first shipment of garlic to the store and choose the largest and plumpest cloves/heads.
Thanks for the info. This site is a real treasure!