There is so much great free material on YouTube. I found five hours of free videos from David Wygant on his official channel. He definitely has a different style than the mPUAs who I have watched before.
There are countless people promoting themselves as mPUAs, so it is good to take everything that you watch and read with a grain of salt. As far as book go, I've alternated between Community publications and more mainstream dating books.
I found Flirting 101 by Andrew Bryant and Michelle Lia Lewis highly amusing. Not to mention, it makes a great conversation piece to be reading a book like that in public.