Taylored Expressions has a die and stamp set - sold separately. This is the die set. To see the stamps, just put "taylored expressions mason jar" in the search box at the upper right.
https://www.simonsaysstamp.com/produ...yDPRoCEtvw_wcB
But what looks like a good size to me might not be what you have in mind. I found them by googling "mason jar stamp die," and they popped up at the top of the page with a photo, so if these don't work, you might want to give that a try.