Up here in Northern Kentucky the most commonly used term for selling firewood is a "truck load"! That almost always works out to a eight foot bed with the firewood thrown in until it's piled slightly higher than the bed rails. I'm sure there are a lot of guys out there that know how to throw it in just right to make it look like you're getting more than you think you are.
Around the smaller towns, a pickup load runs from $45-65, some take it into the bigger cities (Louisville, Cincinnati, Florence, etc) and get right around $125-150, but that involves 50 to 80 miles driving to deliver it.
The big city buyers are usually just people that want to burn in fireplaces, but locally a lot of people use it for primary or secondary heat and I've often wondered if they were really saving any money by spending that much for the wood.
I burn wood in the garage and wood shop, and it's usually locust, plenty of it around here and it does well since I'm there to tend to the fire and add more as needed. Growing up we used a lot of hackberry (good to stoke the stove at night with), a lot of hickory (I never liked that, but Dad did and he made the rules), cherry and white oak. We also burned quite a bit of honey locust, but it had so many thorns, it was a lot of work to take a hatchet and clean them up. You'd always miss some and always find them when you went out to the woodpile at night to get a load!