What I have found at my local box store lumber is very warped dimensional lumber. It also is very wet. The dryer stuff is warped bad. I look down it to make sure it fairly straight then bring home only what I can build with in the next 3 day. Being wet it not a issue if it nailed or screwed together quickly. Anything that sits to long get returned as I'm picking up more. At the end of the project I return what is not cut then make a trip for more on my next project.
Scott
Scott