That's not wear bars, they are not usually on the shoulder, they should be on the inner rows of thread.
Sorry, you posted a pic of a new set, your right, looking at the ones for sale the wear bars are close to the surface. I think maybe 70% worn. But, they are better than $600.
Let me suggest something that I have done a number of times.
Go to your dealer's parts department, ask if they have any (your size) "take offs"
Take-offs are new tires that a customer does not want on a truck when the truck is sold. The dealers just want to get rid of them, you can purchase for about 1/2 price.