I picked mine up from OK Weber
OK Weber | Competition Rifle Parts
He imports them in batches I believe. I was lucky for once, in that he had 2 arriving that someone backed out of, and I happened to need.
Got them in a week!
If I were you I'd order atleast a couple at a time, and get em finished together.
I did this for my gun, and I found that I could swap barrels back & forth with the same ammo without changes in brass measurement or detectable difference across an Oehler. Both barrels seem truly identical and shoot exactly the same(I don't even have to adjust zero).
I didn't think this was even possible..
IMO, it's testament to both Border and my machinist(who might have indexed the bores, I don't know).
Anyway, my nature is skeptic by default. Yet my notions about Border are positive all the way.