Party Bones is one of the two skins released in the Day of the Dead Celebration offer. It could be purchased as part of an item deal for a limited time in early November 2019.
Party Bones could be purchased for $14.99 in the "Best Deal!" which included the Toco Bones skin and 1800 DNA. This skin 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.