Club auction. They never really seem to sell for what I perceive them to be worth. At this point I would rather kill them myself that let someone else maim them for a while. Especially if they got them on the cheap.
If you have trees worth selling then it is worth the cost and effort to vend at a show. It is far easier to sell a tree that can be seen as opposed to a photograph. Auctions and club functions generally do not produce the kind of action needed to move high end material at a profit margin making the endeavour worth its salt.
I have sold via Ebay and as a vendor at at one of the BSF conventions. I made WAY more money and sold my trees for what they are worth at the conventions than I have on Ebay.
I don't remember how many...but I sold some JBP's and (one was a nishiki for $900) and some junipers, olives, azaleas, and had a buttonwood stolen! It's on the BSF website.