Try these websites:

I love my ruffler. I bought mine on ebay for $25 instead of the $100 my dealer wanted. I make these adorable dolls and make a ruffle for the bottom of their skirts and hat, I make ruffles for the edges of throw pillows. They are a pretty clunky looking foot but very easy to use. You remove your old foot and foot holder (?) and then put your ruffler on being sure the little 'u' shaped opening goes over the screw you loosen your needle with. Like you do with your walking foot. Then slide your fabric under the little metal flap and start stitching. it will advance as you stitch and either every stitch, every 6 stitches or every 9. Have fun.....