Hi RottiMommy,
I have only bought one really big stud collar since I moved here, that was for a Bullmastiff boy I had (he is now at the bridge) I guess I should check how long it is, but it is big. I bought it at the Petsmart we have here, it is a leather one quite wide and of good quality, like I said I will have to measure to see how long it is to be sure it is big enough for yours, but I would guess they have them at most petsmarts. I think I paied like 40 dollar for it. And it stayed real nice, I used saddle soap to clean it from time to time, and conditioned it with tack conditioner. But it is hard to find a lot of different things in sizes for our big babies.
Marit