Here is the Headless Horseman's sales history in Roblox: October 31, 2013 - November 3, 2013; October 10, 2014 - October 30, 2014; October 1, 2015 - November 3, 2015 ...

Roblox gives away accessories for free in the avatar shop for players to accessorize their characters. This gives the avatars a head-turning look and benefits players to stay on trend.