i work in a business where i need to have good hearing, and it always makes me cringe when my wife puts the hair dryer on full blast in our tiny bathroom. it makes my ears hurt from 10' away.
i say that to provide some background info, just to let you know how i know where to find good hair dryers...
as posted, walmart and target are good places to find one on the cheap, although there are some nicer ones there. there are some good professional quality hair dryers at sally beauty supply, and although some claim to be "quiet", that's a little subjective. if you have a sally beauty supply near you, check it out. they are also the only local store i found who sell barbicide.
The only advise I can give is that my wife has curly hair and has to buy one with a diffuser. Other than that, going to drugstore or amazon and picking out the top rated one available in your price range is about the only suggestion I can make.