It helps to develop a good relationship with a lumberyard. At my local place, they don't mind cuttjng a length off a board for me as long as they are left with at least 6 feet. They are also self serve, as long as you restack the bins.
Cedar framing is also graded clear and knotty. Most boards are flat sawn, but there's a few nicely quartered boards. Maybe not as much with 2x6 since they're likely cut from smaller trees, but check the 2x12 stuff, which has to be cut from bigger trees
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