Something else to consider is the metalwork and finish on your rifle.

It's really easy to get the action into a condition where the axis lines the mounts sit on aren't paralell. Even with the best, most consistent mounts and rings there is a possibility the rifle could be the reason you'd need to lap.
Even a one-piece mount can be sprung out of true when screwed down to an action that isn't perfectly true to whatever fantasy of a true outer action surface it was designed for.

The work involved in lapping a set of rings isn't so bad though, you could do it yourself for little cost in time or money.

There are rings available which have self-aligning features, where the rings employ a somewhat spherical grasp on inserts which in turn contact the scope tube. I don't recall just who does them, I haven't run them on a rifle myself either.

--Tinker