Ive known George and Irene ever since I came to Providence (Aqua-life owners on Wikiden Street) and they are very nice and willing to extensively discuss fish with you if you have a question. I buy my shrimp, betta and plants there, the stuff is usually-to-always in good condition, they take good care of their tanks.
Its true though, some stuff are very expensive. But then again, I find that Providence things are just overall much expensive than say, NJ or Georgia.
The size is overall pretty decent, a good variety, but don't expect super specific things. I wish they have more shrimp though.