Locally in this pretty small town there is a lumberyard that has dealings with a blade sharpening service. Write your name on the blade with a Sharpie and leave it with the yard. The blade service comes around every so often and picks up ones to be sharpened and leaves resharpened blades, so there's no shipping involved.
As far as finding a service, contact people who have blades sharpened and find out who they use. This can be cabinet shops, construction companies, renovators/remodlers, etc. Also check with people who deal with wood - lumberyards, home improvment centers, etc.
As far as finding a good sharpening service you just have to talk to people who have dealt with some to find one who does a good job and for a reasonable price. A good sharpening service can give you a blade that's better than when it came from the store. We are using some Freud thin kerf blades that cost about half the purchase price to sharpen and work very well. The cheapest blades are really not worth having done.
And now for something completely different....