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I also recommend The Bullet Trap. I've bought four pistols from them. Their prices are competitive even when they have to order one for you. I've never had a employee be anything but courteous and fairly knowledgable. Nice people!
Buds Gun Shop, on line, is very reasonable, they usually don't charge shipping (http://www.budsgunshop.com/catalog/" onclick="window.open(this.href);return false;) and have a very large selection.
Whenever I checked prices at Gun Master I thought they were a bit high. I asked them for a price on a S & W MP 9c, they didn't have one in stock so looked it up in the catalog and quoted me the standard MSRP (the price they wish they could get). I bought it a The Bullet Trap considerably cheaper.