Supposedly there are some pre-wounds out there you can use. I prefer to wind my own as at times I like to use the same color thread in the bobbin as on the top. I ordered bobbin thread, polyester in a number of colors from BFCreations. Other wise I've been using up the old NEB bobbins I bought for the Designer 1 years ago by rewinding them onto the Viking bobbins. My winder works great so why not use it?