moda and marcus brothers both sell wool bundles that are felted, it is easy enough to felt your own...i buy lots of 100% wool at thrift stores, an old man's wool blazer or coat has a lot of usable wool! just take it home cut the seams apart, throw it in the washer with HOT water and a little detergent, rinse with cold, then dry in a hot dryer...felted wool ready to use.