Maybe a qualified "home repair" person. Sounds like it's not really a plumbing problem so why spend that kind of money on someone who can't do a complete job. Check with your local hardware store and see if they can recommend someone.
You could always do it yourself. I'm betting that Chapel Hill has a Home Depot, see if they're having any tiling siminars.
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"The truth is merely an excuse for lack of imagination." - Garak
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