[ArcticDriver]

It sounds like a challenge to find one so I'll give it a shot. Didn't know that there was such a thing as local "alternator/battery" guys. Assume these kinds of shops are run out of someone's personal garage.

These are typically bricks & mortar shops that have been long established. A bit like radiator repair shops...a holdover from an earlier era.

 

[ArcticDriver]

You can find them in old Industrial areas of the City. 15 miles away is not surprising since its a niche market and demand is small.

NYB has introduced some valid points. You might want to research Customer Reviews and ask specific warranty questions to the shop you found. As well as their price vs a quality retail alternator mentioned in earlier posts.