Thanks! I got the rocks from a local hole-in-the-wall gem store. The guy sells rocks, gems, geodes, tumblers, jewelry making stuff, that sort of thing. He's got a customer for life out of me, I tell you what. As long as I can't find any ADA-type rocks, petrified wood is where it's at. I told him what I was looking for, sizes, shapes, etc., then gave him my phone number and asked him to call me if he gets anything.
He called me the very next day. I then paid him a visit, and right before I walked out of his shop he was $70 richer.