On Sun, 26 Feb 2017 12:00:06 -0800 (PST), Bob Simon
wrote:

We have two 24 year old toilets that don't flush well so I plan to have them replaced. The powder room has a standard 12" rough in so there are lots of choices. My wife selected one whose style is similar to the sink with dual flush capability and comfort height quiet-close seat.

But the master bath only has 10" rough in which limits options greatly. What would it cost (ballpark estimate) to have someone cut the slab and relocate the drain two inches away from the back wall? Or is this just completely impractical?

Can't give a price for the work. You might look into an off set toilet
flange, This guy moved his toilet ~ 1.5 inches. There may other
flanges the would give the rough in distance you need.

https://www.youtube.com/watch?v=-q42iLlSKWA