wharvey, catwood,
I believe that Cape Air (9K is their code) is running a special right now for weekend roundtrips BOS-PVC or v.v. At least they had been advertising something in the Banner a few weeks ago along these lines.
Best bet is to give them a call and speak to a sales agent. 800/352-0714.
Last summer, the booklets were $780 for ten one-way vouchers. That works out to about $150 per weekend -- quite reasonable considering the convenience.
I was down there on Saturday for a board meeting of an arts group. I was surprised at the number of people in town. The off-season just keeps getting more and more popular. Next weekend should see the usual mix of townies, wash-ashores, and day-trippers. Some shops and bars are open. Pick up the Banner when you get to Orleans. Provincetown is about a 40 minute drive from there.