Nice. I love the smell of cedar. Early last spring I bought a dozen, 10-foot-long cedar 4x4s to build some raised beds for growing tomatoes at my workplace but those 4x4s are still sitting in my storage room... And the business is still keeping me hopping, so I'm not sure those beds will get built for next year either. But that storage room sure smells nice!
I get cedar for raised beds at Grant Cedar Mill in Grant, TN. I buy 1 x 8 x 8 rough sawn. That works for 4 ft beds and use 2 x2 in corners. 1 inch cedar will not bow but I usually use a 1x scrap half way for support. Eastern red cedar will rot, but some of mine is 7 years old and holding up well.
A 1 x8 x 8 is about $6. I 40 exit 254 from the east.
Your 4 x 4s will likely last decades?