There's a similar thread in Classic & Vintage and I might post these finds in that forum also, but these are tandem specific. I could not find such a thread in this forum so here goes. These turned up on the Richmond VA CL today. Not mine.
Burley Tandem, Bike for 2 - $600 (Hanover)
http://richmond.craigslist.org/bik/4956222528.html
Burley Tandem, good condition, V-brakes, Shimano Bar-Con shifters, Size ~20.5"/18.0" (center of bottom bracket to center of top tube), 24 speed, rear rack, dual computers, Good condition, $600 Cash,
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http://richmond.craigslist.org/bik/4956210309.html
Bushnell Triplet (bike for three) - $2600 (Hanover, VA)
condition: excellent
Bushnell Triplet, (tandem + 1)Aluminum frame, High end Shimano components, 27 speed bar end shifters (index shifting on rear, friction on front) Magura hydraulic rim brakes (most powerful rim brakes made), 2 leg kickstand, Frame size 19/17/15 (center bottom bracket to center top tube), 700X35 tires, Shimano SPD 535 pedals, Blackburn rear rack, Cateye computer, Under 56 pounds as pictured, excellent condition. $2950 Cash, NO TEXT MESSAGES