I didn't see anything in the rules prohibiting posting an eBay link, so here we go:
https://www.ebay.com/itm/302629158725?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649My hope is to upgrade to some A6 units after selling these. I have four to sell, but eBay limits are preventing me from listing all 4 at once so I just listed 1 for now.
Currently priced at $1499 or best offer. When I look at completed listings I saw a couple of the "single tube" ones going for that price or more so I figure this was a fair starting point.
Obviously I will consider lowball offers after some time passes, but not immediately.