Really? Awesome! If anyone on here has some extra fibers, please PM me. Haha!
I don't have a place that I normally get them. I've just gone online and looked for nice deals and have bought some at craft fairs. One lady gave me a fleece that she didn't want to wash - it had a lot of VM (vegetable matter) to clean out of it. I washed it up, died it with koolaid, spun it, and knitted it into a neck warmer and fingerless mitts for a friend of mine. There's a lot of ways to find fiber. I initially learned to spin because the Extension office in my county put together a fiber arts group and we did all kinds of fiber arts.
For my first bit of spinning, I just bought some natural colored wool roving. All I had to do was draft it out and spin - no prep needed. And since it was a grayish color that isn't very popular, it was really inexpensive. That way I wasn't starting with anything expensive and being disappointed when it didn't come out as evenly textured while I was still learning.