Nova Montgomery sells them on her website (although she's currently out of stock) here:
http://www.novamontgomery.com/shop/S...b-x4345532.htm
I ordered one from
http://www.singer-featherweights-rev...our-store.html and I love it. Apparently, the white Featherweights have a different bulb base from other Featherweights. This website has both bulb types in the LED version.
LED bulbs are always expensive. Sewing machine LED bulbs are no exception.
Sue