When we remodeled our house I was working on some joist in the crawl and kept climbing over refrigerant lines. Then it dawned on me that our our condensate units were on the opposite side the house. I realized everytime the air conditioning had been replaced over the years the HVAC guys was just cutting the lines at the units and leaving the line sets in the crawl. I can't remember what copper was bringing then but after hauling 4 lines to the recycler I think I cleared nearly $200. WooHoo! free money.