Yes they’re often called “Nib Meisters” and I’ve used them in the past too, but then I learnt how to do it myself as they charge anything from £30 to £60 to grind a nib. And it only takes about 5-10 minutes!
All you need is a Dremel with a few different heads (grinder and polisher), some micromesh and some powerful magnifiers and you’re away. It takes a bit of practice and I wouldn’t say I’m an expert, but I can grind a very acceptable cursive italic (wide downstrokes and thin cross strokes ) or an architect nib (opposite to a cursive italic). It’s actually good fun and the queue for these guys at pen shows is usually out the door. So anyone on here who’s got a bit of patience and enjoys getting inky fingers (it is quite messy) could learn how to do it and posssibly make a few quid.
Cheers
Ash