Went with Amy to go looking around at the Antique Center of Texas here in Houston today, and ran across two dealers with nice displays of Parker 51s.
One guy had a nice old store display along with bottles of 51 Ink and 3-4 51s in various condition. The other display had a huge number of pens, with at least six or seven 51s (both vacumatic and aerometric).
Unfortunately, all the decent 51s were priced from $85-99. That’s about $50 more than what I’ve seen as the current eBay rate, otherwise I would have come home with one.