I picked one of these up from a dude that works in an auto shop a couple weeks back for 35$. Wanted to sell it on ebay, but learned you have to have them certified before you can do that. Thanks, EPA. Anyway, I'm curious as to how much it's worth in scrap, and also what the exact process is to certify cattys so I can sell it for reuse. It seems in good shape and the honeycomb looks very clean on both sides. Figured it was a good buy at 35$, hope I wasn't wrong.