Grizzly is one of the three skins released under the Wicked Circus part of the Circus offer. It could be purchased as part of an item deal for a limited time in early December 2017.
Grizzly could be purchased for $4.99 in a deal that included 3250 coins. It could also be purchased for $19.99 in the "Best Deal!" which included the Wicked Clown skin and 1800 DNA. Grizzly was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The Wicked Circus sub-offer was released again for a limited time in early July 2019. This time the deal that included 3250 was lowered to $1.99. The Best Deal was lowered to $9.99 and the included DNA was replaced with 30000 coins.