Zenith makes high quality boar brushes that I would say are just as good, if not better than Semogue. Omegas are good too, but I think they are just a different style of boar knot. Untreated, a little scrubbier.
TheGentleShave.com sells them out of Cleveland, Ohio. I happened to check their site the other day and it seems like their prices went up since the last time I looked. I've bought them from Your Shaving out of Europe before too and found their shipping prices and time to be reasonable. A third option is the RazoRock Blondie from Italian Barber. It only comes in one style of brush with an olive wood handle, but it is a Zenith knot and it's only $22.
Tedolph and
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