Do it yourself - lots of threads here on how-to...just buy the right solution and sensor swabs and be careful - it's not as fraught an experience as you'd think...the bypass filter is actually pretty tough unless you scrub it with an old t-shirt (as someone here did recently...lol).
It took a few loops of cleaning and testing the sensor for dust ( camera set to f36, close focus, non-wide angle and then shooting a white computer screen and then pumping up the brightness and contrast in post processing). This link shows how inspect for dust http://www.cleaningdigitalcameras.com/inspecting.html and my results were similar to their screen shots before and after.
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