A first (as far as I know) appeared on Ebay yesterday:
A graded version of the 2011 Heritage Barney no position card (link to auction here). The seller has it as a Buy It Now / Best Offer with a price of $200. That's twice the average price of the raw card.
You can see that the card has a grade of 8.5. The price seems high for a card with that grade. $200 for a 10 maybe, but not an 8.5.
I checked the PSA population report (you'll have to type in "Darwin Barney" into the search bar for the report) to see home many of these have been graded. I guess this is the only one since the card isn't even listed in the pop report. My guess - it was just recently graded and PSA hasn't update their list.
I won't be buying this but I will be an interested bystander.