The library is an excellent source of material if you low funds or are on a budget. One of my favorite books from the local library is Low Magic: It's All In Your Head... by Lon Milo DuQuette. He is United States Deputy Grand Master of the OTO. My other favorite is Rediscover Magick of the Gods and Goddesses by Jean-Louis de Biasi. Jean-Louis de Biasi is Grand Master of the Ordo Aurum Solis. You can read more about him at the Amazon site which shows his books. I came to know the Ordo Aurum Solis through the books of Denning & Phillips awhile back.
I've got to examine the rest of my library a little more to see what publishers are in my top 5 and get back to you on the rest.