a neighbor is selling a cedar strip Reliance double for a client of his

Mike-
You are in the PNW, WA state?
Checking the Craigslist Seattle listings might give you some ideas.
There are many sea kayaks listed, usually.
I wouldn't expect to get much - a tandem without a rudder is not a common (or desirable?) boat.
And, my experience is that strip-built boats aren't easy to sell - even kit S&G boats go more quickly around here.
Somebody had a glass tandem (by a known company) listed here in Victoria yesterday- they were asking $500 for it, and I recall it had some gear included. It was priced a bit low, so sold quickly.
I suppose the paddles are extra-long since the boat is a tandem?
Bending Branches makes paddles at a range of prices - if they are better quality ones, the two paddles are probably worth more than the boat.
Are they including sprayskirts?