User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-5563819-20130323005139/@comment-3124449-20130323040704

(I think) every Companions member can be a follower, and many serve as skill trainers. Or, go to the "Follower" or "Skill Trainer" pages, it lists several ways to get your money back from non-follower trainers.