Necromancy Subclass?

I would like to create a wizard with the necromancy subclass, but I can't figure out where to purchase the subclass. I bought the 5.5e Player's Handbook a few days ago, but that subclass is not included in the book from what I can tell. Does anyone know where I can get the subclass? If it's part of a different book, would I have to purchase the whole book or could I purchase just the subclass from that book?

Quote from Ninjacoolstuff >>

I would like to create a wizard with the necromancy subclass, but I can't figure out where to purchase the subclass. I bought the 5.5e Player's Handbook a few days ago, but that subclass is not included in the book from what I can tell. Does anyone know where I can get the subclass? If it's part of a different book, would I have to purchase the whole book or could I purchase just the subclass from that book?

There is no 5.5e version of the Necromancer subclass (yet). 

You can still use the 5e version of the Necromancer subclass with the 5.5e version of the Wizard class, but you'd need the 5e Player's Handbook for that. You can either purchase it or join a campaign where it's being shared.

Unfortunately there's no longer any way to purchase individual character options from a book; they got rid of that whole concept when they redid the marketplace site a while back. No one's really happy about this, but it's what we have to live with now.