After looking at one of our photos, he said he wondered if that was a stone made by Sears.
Surely he was kidding.
If you have a subscription to Ancestry.com, you can look up old Sears catalogs. They started producing a tombstone catalog right after the turn of the 20th century. In the catalog, they advertised marble gravestones quarried in Vermont for sale at what Sears claimed was "less than one-half the lowest price at which any dealer will furnish you the same size of inferior workmanship and finish."
For a time, engraving cost 2.5 to 6 cents per letter for incised lettering, and 18 cents per letter for raised lettering in panel.
Just goes to show...
You learn something new every day...