Most people consider the Hankook RA08 to be the gold standard for bus tires, but Anthony clued me in to a Chinese tire that is the same spec:
Goform G325. I got to see them first hand on his camper at the dead of winter campout, and they look pretty good plus they are about half what the Hankooks cost.
The only thing I don't know is how long they will last, and that's a biggie to me. I got ten years out of my Yokohamas, arguably they are in need of replacing though. I'm still leaning on picking up the Hankooks though, just for peace of mind. The cheapest price online I have found is $85.40/ea.
I put together a pricing matrix to keep track of everything while I shop. If you find any other deals let me know. I'm hoping to pick some up with my tax return. Mine are quite a bit worn!