I have an old one piece crank I like to carry into shops so I can judge if they are any good or not. If the losers won't help you with a $15 dollar bb rebuild kit.... leave and never come back becuase sooner or later, you're going to get screwed over dealing with them.

I personally stay away from trendy places and stick to older shops. Fixed gear bikes are not hard to work on... any good tech can help you.