This question is impossible to answer since we haven't seen your local fish store. For some members, their local fish store is Wholesale Tropicals, recently voted the second best in the UK, so I would definitely say yes to that, for others it may be some grotty little rundown place with dead fish littering every tanks. The only thing for it is to make a tour of all lfs around you and look out for the following points:
are there lots of dead fish in the tanks?
do they look as if they have been dead a long time? (bad point- fish die in all shops but should be removed before they spread infection)
are there any signs of infection in any tanks (e.g. ich)?, if so, does the tank have a not-for-sale-sign? (if not, bad point)
are fish together in tanks that shouldn't be together? (e.g. bettas with serpae tetras)
I always take a specially careful look at the guppies, IMO they are indicator fish
do the staff appear to know what fish they have?
are there any coloured/dyed fish in the shop?