Handiquilter has a Facebook page where I have seen used machines listed in the past.
I bought my HQ 16 second hand just over one year ago. I live on Vancouver Island where there are very few used LA machines. I paid more than I would have if I found the same machine off Island, but would have incurred $$$ getting it.
I was the first of about 6 people looking at the machine and the first with cash. The seller, let me try it out in her home, then she and her husband disassembled it for me to pick up a couple days later.
Oh, the lady I bought from listed her machine on Tuesday, I saw it on Wednesday, left a 10% cash deposit and picked it up on Friday, paying cash for the balance.
Does your guild allow you to announce sales? What about a notice at your LQS?