If you score some scrap from a construction site it does'nt hurt to get a bill of sale for the material. Even if you don't buy it, it may save you some grief if the police are investigating a thief ring.



If your out and about swing buy plumbing and hvac supply houses, talk to the manager and see if you can pick up the water heaters,furnaces,disposals,condensers and etc. Most supply houses allow plumbers and hvac techs to dump there since they purchase from them.