There are a
ton of nice tandems on central-northern California Craigslist right now, including a triplet Friday for $1500 in SLO, a 2010 Cannondale for $500 in Sebastopol, a coupled Santana for $1300 in Cayucos, a $300 hybrid KHS from the v-brake era in West Sac, three Paramounts...
...and the usual slate of 27" Burleys and Santanas dying on the vine, which I guess will soon be joined by V-brake 26ers.
Craigslist tandem search link
It would be cheap af to get onto a tandem around here right now. I have this idea you could run a business rebuilding 27" Suntour tandems into 700c Shimano bikes, but I guess the price wouldn't be something anyone wanted to pay.