LBS or prowheelbuilder .com for starters. Most difficult part for me was double and triple checking my spoke length. The assembly and truing was cake. As someone else said, building a wheel on a track hub is quite simple because it's completely symmetrical. I trued it on the bike in the dropouts. I used linseed oil on my spoke threads, and have never needed to re-true my wheel, or ever got any pinging. I'm excited to build more - I wish I had a wide-tire-friendly bike so I could build up multiple wheels...