I think you would have a great time just coming to experience nationals if you have never been, watch the show, visit with people and see if you can find something to take home would be an added bonus.
I know I am hauling a load up showing, and also hauling about 7 babies, 4 of which are already sold, 2 still for sale and one NFS. (one of those two, I'm offering as a under show gelding, all siblings are National Champions)
On a different note; I thought about this for a few years.......thought about it after remembering reading in the show program at Worlds how the horses showing that were also in the world show sale would have a colored dot on their show number.
I think it could be neat at Nationals....to have different colored dots; one color means "for sale", another means "sold" (which you could have it as for sale and then overlap the dot with a sold color if it sales), guess if wanted could even have a NFS one.
I just think if someone in the stands could have something visual stating yes that horse is for sale they might be more apt to approach the owners to inquire about it.