The Glock Fade is currently the rarest and most expensive of all Glock skins in CS:GO.

The iconic StatTrak!" M4A4 | Howl is possibly the most expensive CS:GO skin and certainly the rarest.💯 It's a contraband skin (the only one of this rarity), which means that you can't get it by opening cases💯 anymore. In fact, the only way to obtain the Howl is through trading it with other players on skin marketplaces.