Description (from the D23 Exclusive Membership site): Celebrate the 25th anniversary of The Great Mouse Detective with this collectible Disney pin starring Basil and Dawson. This glittering tribute to the classic film was created exclusively for members of D23: The Official Community for Disney Fans.
Where can it be purchased: As the description states, this pin was made for D23 members only. However, if a member is willing to sell their pin, the best place to check would be eBay. Credit of the photo goes to the Disney Store D23 Membership website.