Yes, most companies will say that their meters are calibrated. And I suspect they are
once at the factory. pH pens tend to drift a little bit. The better more expensive ones hold calibration for longer. A bit of cal fluid is a nice backup and safety check. All you need is 4.0 and 7.0 fluid. A 2point calibration is far more accurate than a single. However, if you're on a budget I would pick up just the 7.0 for now. I've used these from biopharm:
Amazon product
You also need storage solution as letting the glass bulb dry out will kill your meter. You cannot store it in tap, distilled, or other water solutions.
I have this one from Apera. $15-ish and has lasted over 2 years at this point and it beyond its expiration. I only had to put a few drops in the cap.
Amazon product