I have no idea on price, but since Cesar does tile, have you tried to give him a call to see if he can do it and/or get an estimate? If he doesn’t do it himself, he probably knows people that do it. I would at least get a quote.
We took out our on tile in our kitchen and took out the hardiebacker. It was not fun at all. Luckily, not a lot of it. Let us know how it goes.
