I worked for a company that bought a B-17 out of the desert, supposedly for less than the value of the fuel in the tanks. Used it for a while as an air tanker, then sold it to a private collector. They also got six C54's (actually they were the Navy version of the C54) from there for about $6k each--this was in 1977. Most had airframe times in the low 30,000 range and they took a lot of work to make airworthy again, but all eventually flew as tankers. They also got some Lockheed PV2's (not P2V's) from there that had less than 300 hrs TT.