I would think that a reground roller, from a factory roller motor, should be available and reasonably priced. Should be lots of cores avaliable. When you talk of a RETROFIT roller (440, for instance) prices go thru the roof.
I have a bbc roller with a couple damaged lobes like that. It was a very aggressive grind. It had several weak springs, when the valves floated (the owner, not me, was rev happy) it wrecked the lifters rollers and chewed up the cam. I probably (maybe, it's a billet cam) could have it repaired and reground, but I don't think I would trust it.
On the other hand..... I have had reground rollers in my max wedge and my 406 chevy, and had no problems with either. It also helps that the reginder is 15 miles away.