Barry,
We buy Kumho's several hundred at a time. Seems like they are always on backorder. Last I was told is that our current backorder will be filled by the end of April.
I spent most of the day Monday tracking down tires and found several 165/80s "here and there". Most I could get from one place was Mid America, who found me 50 of them. They might know where a few more Kumhos are.
Unfortunately they were 2x what I normally pay, but what can you do...
Nankang makes a 165/80 I hear good things about them from some of their distributors, although my personal experience with them has been pretty poor. In a 1/2 container I had a TON that were just plain poor quality. I mentioned this to a friend out West who is a HUGE distributor of VW parts and carries only Nankang tires and he said he's literally had 1 or 2 problems in several years (he averages 900 tires a year). I find it hard to believe that I had so many bad tires and it was just luck, but he's a straight shooter, so who knows. Bad taste in my mouth, plus a dent in my wallet, means no more Nankangs for me!
In my search I also found a tire called Nexen. They make 165/80s for $30 - $50 each. You can find a few distributors on ebay if you search "Nexen 165". I know nothing about them, other than what I was told by the wholesale sales manager at the main facility. I'm sure he is totally unbiased ;)
MAM called me back with the Kumhos shortly after I spoke with Nexen, and since I have TONS of experience with their quality (99%+) I decided to stick with what I know.