What a wonderful stash! We all wish to have such a stash. Give me directions and I'll drive up next week. LOL
I would think selling it in lot colors would be the best, all reds, or all greens, maybe lots of 5 yards.
No matter where you sell it, you are going to have to pkg it up and get it to the post office.
5 yards fits in one of those small flat boxes, if it fits it ships. Good luck.