Military Best is pretty good, I've gotten a few thing from them in the past. Their shipping used to be free on patches too, but it looks like they might have changed that.
http://www.1800nametape.com/ Is also a pretty good site though. Depending on what you are looking for you might give them a peruse, its run by some nice people and I have never had an problem ordering from them in the past.
I run a clothing line for my day job, and I have personally used a place called Popular Patch for both getting some morale patches and custom patches. They specialize in military patches but have some generic patches as well.
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