Felting

I've discovered felting. It all started with some Manos del Uruguay knitted slippers that were designed to be felted. (Unfortunately they're still too big; must thread in some elastic.) Moved on to wool sweaters from Goodwill, which — if I ever find the time — will be deconstructed into purses and embellished with embroidery. Anyone know of a source for transfer paper other than the chalk tracing stuff from the fabric store?