My experience is when I bought mine. I searched Craigslist for a long time. I found one I could afford about 100 miles away. It is an HQ 16 and the poles come apart in sections. We had a small pick up and it was fine in the back.
I would advertise on all the sites out there previous people have posted. You have to be realistic about how much you will get. It months go by and no one has bought it, I would assume you are asking too much.
Also if you have local guilds, groups, etc you might be able to advertise through them.