Well first thing to decide is if you want to sell them as-is on the rims or not.
This can make things alot easier for a buyer b/c they don't have to pay for mounting used tired. But of course that's only useful IF the buyer can use the same style wheels you have, AND you plan to replace your wheels anyway.
Then the price would include tires + wheels.
If your plan is to just go to a tire shop and have them replace yours and give you the tires back, so they are unmounted, then you're probably looking at getting 75% retail price at best (remember seller will have to pay for mounting + get no warranty).
I am guess from your pictures that there is 3/8" tread which is like 12/32 the tires starts with 16/32 from the factory new. So basically there is 87% tread left. Which not all 87% is useful. So they sell new for $736.00 on tirerack.com which 87% of that is $640. You can't really get back the labor on things like this because the new buyer will have to pay for that. I would think that you could probably get 500 out of them.
Of course the last set of BFG 265/75/16 that were on started out at like 450 and ended up selling for less than 200 and they were in similar shape. Off of a Tacoma no less.
What BigBody said, just do the math on the tread depth, but keep in mind the last 2/32" is useable since it won't pass inspection. So, If a tire has 16/32 tread new, then it has 14/32 worth of usable tread.