Well, The weather forecast today is quite iffy, and the seller wrote last night that he wasn't available until after noon-without offering me a tentative time. He said he'd write again 'sometime' this morning. (I didn't want to offer my phone number-and apparently he didn't, either.)
As a person who prefers to have a game plan for the day, this may turn out for the best. I bought my Jamis bikes at Harris Cyclery in West Newton, but it doesn't seem that they carry them any longer.
1990 Univega Alpina/(stock) gel saddle
2009 Specialized Dolce Elite/BG Lithia saddle
2009 Jamis Coda Sport/Selle Royale Respiro saddle
2010 Jamis Aurora/Jamis Touring Sport saddle