1 full cord of seasoned oak/pecan mix, delivered, not stacked = $350. I go through about 2 cords per year, but I also use this wood in my BBQ pit and indoor fireplace. I recall doing a rough calculation once and came up with $5-10 per firing, depending on ambient temps. Fuzzy on the details. My use is strictly residential. If I were doing this for profit, I'm sure I could come up with less expensive fuel sources.
I try to get the most out of each firing, roasting meats and baking breads with the residual heat.