I love to spin and knit, and long ago I had a spinning and knitting hobby business. It didn't make enough $$, so it stopped being a business.
I know people who have spun dryer lint, couch cushion stuffing, cotton balls, pet hair of any kind. One person snipped up feathers from a feather duster (bright pink) and carded that in with wool. Since this is a chicken forum... oh, the possibilities...
I haven't looked at wheels in a long time, so I would probably gasp at the price. Lots of them are now made with a double treadle. Those were just getting popular when I had to close my business and "go back to work."
A friend of mine made her own wheel and started with the flyer, since that has to be so well balanced. She said if she could make that, the rest would be a snap. It worked very well, too.
When I first started spinning, I asked a friend what wheel I should buy. She had many different ones and said if she could have just one, it would be a Louet, so that's what I bought. Since I knew I was going to be knitting sweaters, which take a lot of yarn, the large bobbin size on the Louet was a deal maker for me. A fat core bobbin was available for it too, to help with short fibers like cotton.
Now that it's cooling off... fiber is calling me... Maybe when the garden is done I'll have some time!
Sally