I was buying really nice 1 1/2 inch wide 2 ply nylon collars from KV Vet for $4.29 but the company that made them (Stockmans) has gone out of business! What a disappointment, I used to buy them by the dozen and donate them to pit bull rescues. They were one of the few wide collars that came in 16" and 18" lengths.
So now I'm looking for similar ones and not having much luck. I was recommended to try a "seatbelt" collar from this fellow:
The collars look nice and the price is great. I don't need a 3 ply collar and I hear the seatbelt ones are 2 ply and softer.
I've also bought some nice collars from Acme Kennels:
Their double leather collars are riveted together and they last forever! But they are very stiff when new and I had to soak mine with mink oil to soften it.
I also like the Valhoma collars, they are 2 ply nylon 1 3/4" wide:
They are down about 2/3rds on the page, a good collar for $7.25, and they have the smaller sizes and lots of colors.
I have a few big leather "agitation collars" I bought on ebay, the last one I took a gamble on and it's HUGE!!! I think it's a 28 inch 2" wide Bob Allen collar.... It could be a belt for my dog! The seller did not put in the size and I took a flyer on it.