These don't have that on them, so that would be a little more costly. But when I was researching prices I was looking at the cheapest not what would be most collectable. I will go through my bookmarks and find the link though they might have something like that but a little cheaper than the company you found, I have no clue, as I wasn't looking at adding serial numbers and COA.
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It added about $1 per coin. The die cost is where it adds some extra costs! The average cost for each side of the coin was around $700-1200 depending on the complexity!