Merry Outlaw is one of the three skins released in the Tiny Jack & the River Brawl offer. It could be purchased as part of an item deal in February 2017.
Merry Outlaw could be purchased for $9.99 in a limited time deal that included 16000 coins. It 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: Tiny Jack and the River Brawl offer was released again for a limited time in early April 2019. This time the price for Merry Outlaw and the 16000 coins was lowered to $4.99.