How much is a cord of wood
Don't be cheated! I don't think I've ever heard anyone evoke the "legal definition" of a cord of wood, but a cord of wood is simply 128 cubic feet of wood, regardless of how you stack it. To test this voluminous theory, one need only take a known cord of wood re-stack it into any of thousands of clever shapes, from a Volkswagen bus to an intergalactic starship. It's still 128 cubic feet of wood... and still a cord. QED
To find what you should pay for any delivered wood, simply stack it (tightly) into any convenient stack and multiply length x height x width (in feet). Divide that result by 128 and multiply your answer by the price-per-cord that your supplier wants.
For example, if your stack is 3.5 x 5.5 x 6 feet, you will find you have 115.5 cubic feet (Not quite one cord, right?). Dividing 115.5 by 128, you get 0.90. Multiplying 0.90 by the advertised price of, say, $200 per cord means you owe your supplier $180.47. Don't quibble, but don't be cheated.