Any new Slayer sources?

[Melkiador]

I can't afford to get every player campaign or additional resource that Paizo publishes, so can anyone tell me if there are any new sources for Slayer options that I don't know of?

I've heard that the Inner Sea Races has a couple of new slayer talents. Besides that, I only know of the ACG and its player companion having any options for Slayers.

[Imbicatus]

Weapon Master's Handbook is a must have for any martial including slayers. None of the option there are slayer specific, but they are great for anyone using weapons.