I suspect the TARGA price agreement is more or less Ferrellgas' standard offer, at least in the SLV area. I switched to Ferrell last January (yay!) specifically asking for the Bonny Doon plan, but since I'm technically in Ben Lomond the Ferrel folks just shrugged and said don't worry about it. I believe there's a group in Boulder Creek with a similar agreement with Ferrell.
We also had some trenching and piping done in conjunction with the service switch, and have nothing but great things to say about Ferrellgas. They explained what they needed for a trench, I did the labor, and they did the install. Perfecto.
Just give em a call and they'll get you on their calendar for tank swap, etc.
The Ferrell crew were outright heros when somebody stole the 100 gal tank from the Alba Schoolhouse right before a big winter shendig last year. Set us up a loaner tank in like 48 hours! (Our new tank is now bolted to the pad!)
-Danny