Ships June 2016. Retails for $35. Officially licensed.
As of 2018, they're distributed by Sideshow Collectibles as well.
From the manufacturer:
Our Mandalorian Skull mini sculpture is a wonderfully realistic interpretation of the mysterious skull marking seen on the armor of iconic bounty hunter, Boba Fett. The mini skulls are an eye-catching piece of artwork sure to bring a bit of the Star Wars universe to any home or office, desk or shelf. Each skull is made in the USA, hand painted, and comes ready to display in a beautiful full color box.