You might have gotten it right if you had not assumed the jar was round, but had looked at the OP's photo to see the jar's actual shape.
"All in all, there were 489 of them." So you paid a little over 4 cents a piece for them. About the same price I would pay buying a few rolls. A fair deal.
Yeah, hard to do good math guessing the radius/diameter as well. It certainly wasn't an imperial pint or U.S. liquid or dry pint or the number of pennies would have been lower. :yes: