One of the best shops in Vancouver (IMHO) buys all their straight gauge spokes unthreaded. They have a DT cutting and threading machine... it's hand operated but works real nice. They cut and thread every spoke! I have stood there and waited while they did up my spokes I used to build my track wheels. I used straight gauge but now wish I used DB, oh well. Anyway, if you can find a shop that does that you might be in luck.