It depends on the lumber. I assume you are talking about construction grade stuff. 2x4s and the like. A trades focused yard may not have as good of a price as the big box stores. Really, if they do it will be volume pricing for regular customers. The average joe will end up paying more for a 2x4 and a true lumber yard. Those lumber yards offer many additional services that the big orange or blue stores don't. Scheduling, deliveries, plan take-offs, credit terms, a cup of coffee, etc.