Can't See Storm Sorcerer Subclass Under Xanathar's

I was thinking about a new character and thematically i wantwed a storm sorcery but i can't find it for individual purchase. is it no longer available? this is the list i can see under sublclalles.

• Arcane Archer

  $1.99
• Cavalier

  $1.99
• Circle of Dreams

  $1.99
• Circle of the Shepherd

  $1.99
• College of Glamour

  $1.99
• College of Swords

  $1.99
• College of Whispers

  $1.99
• Divine Soul

  $1.99
• Forge Domain

  $1.99
• Gloom Stalker

  $1.99
• Grave Domain

  $1.99
• Horizon Walker

  $1.99
• Inquisitive

  $1.99
• Monster Slayer

  $1.99
• Oath of Conquest

  $1.99
• Oath of Redemption

  $1.99
• Path of the Ancestral Guardian

  $1.99
• Path of the Storm Herald

  $1.99
• Path of the Zealot

  $1.99
• Samurai

  $1.99
• Scout

  $1.99
• Shadow Magic

  $1.99
• The Celestial

  $1.99
• The Hexblade

  $1.99
• War Magic

  $1.99
• Way of the Drunken Master

  $1.99
• Way of the Kensei

  $1.99

 It's purchasable from Sword Coast Adventurer's Guide.

thanks =)