Northland Forest Products have a good selection of lumber, they're not cheap but you can save a lot of money by purchasing their raw lumber stock and milling it yourself. I've always found it's better to spend a little more on good stock instead of getting the cheap stuff at the big box stores and regretting it later. We were buying wood for exterior use so quality was even more important because it had to resist weather damage. They are knowledgeable and helpful if you need assistance in choosing the right wood to use for your project.