Lelands.com is a New York-based memorabilia auction house, and in December sold this Pittsburgh Penguins alternate jersey for $529.84.
It's an alternate jersey, but one the team never wore.
According to the item description, the jersey, designed by Pro Player, was slated to be the Pens' alternate look for the 2000-01 season. Pro Player supplied the Penguins with their jerseys, but before the 2000-01 season began, CCM/KOHO won the NHL license to supply every team.
I checked with Tom McMillan, VP of Communications for the Penguins, about this and he said he never saw this design back then. That's not to say this wasn't a possible option for the Penguins, but it could have been an internal Pro Player design that they were planning to present to the team for possible use that never made it.
The Penguins would instead introduce the black and Vegas gold look for the 2000-01 season that lasted until 2007.
Whether the jerseys were a true possibility to be alternates or not, I think we can agree it was for the best that they never saw the light of day.