Thanks. Got it right where it was, hahaha!
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To answer your question though, I got it from a local landscape supply place.
I quickly threw it out last September so we would have something other than dirt to walk on. I wanted to put it in concrete or mortar then, but the wife wanted to put it on dirt and fill the gaps so it would have grass growing between. I told her it wasn't a great idea.
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Guess who got the "opportunity" to do it twice
At least I can make her mortar all the joints now