If you can't find a used one, you may want to try Garhauer - I bought stanchions from them a couple years ago. If I recall correctly, it was only about $25 a stanchion.
I bought a couple of these. They are not cheap but they are very solid. I bought some $25 ones and the first time I put the chute up reaching I bent the cheap ones - so I had to replace them with more beef. So I did NOT save money by buying the cheap ones. Just and FYI.
David Bows Mallorca - Hull# 397 ~~~~~_/)~_/)~~~~_/)~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|~~~~~