They're sold on ebay but I contact the dealer (in Taiwan) directly for a better price. This is the second set of hubs I've purchased from them. The other set is on my road bike and they have been great. They're good with basic English, but be really specific about what you want.
ebike.store at gmail dot com http://circusbike.com/
A little update. The build is slowly coming together. I'm planning on having it finished by April so I can race it at the Sea Otter Classic. I pulled the Cook Bros crankset from the same bike that had the Judy SL fork and will be putting on 28/40 chainrings for the 2x10 system, and have confirmed that there is more than enough clearance for them. The crank bolt caps needed refinishing (already yellow) and I luckily found some spray paint that is an incredibly close match to Judy yellow. The stem is just a placeholder for now. I'm on the lookout for a silver 90mm 0-5 degree stem. The next step will be to build the wheels now that I have all the parts.