This is a serious question if you hate paying retail markups for low quality product. And it has an easy answer.
Find you local supplier of restaurant firewood.
It's that simple. They probably take cash only. They may not be listed on google. They probably operate out of a trailer. If these conditions are met, you're in the right place. But several large bags of whatever he's got. If they only have logs, get them and baton them.
This is where I used to go in Houston. I don't think their CEO flies around in a private jet.
High end restaurants often cook over a real wood fire. So they need a lot of wood. So basically you're buying quality product at wholesale prices. And you're supporting your local community.