Here's the part but you'll have to do your own service call: http://www.repairclinic.com/PartDetail/Kenmore-Microwave-Door-Handle/3650W1A075H/1266797?modelNumber=721.62643200&ss=a6b6d691262&mr=1
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Here's a video on how to do it:
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https://www.youtube.com/watch?v=8S7zsWndDfk
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The purpose of this site is help people learn to do their own repairs.
Here's the part but you'll have to do your own service call: http://www.repairclinic.com/PartDetail/Kenmore-Microwave-Door-Handle/3650W1A075H/1266797?modelNumber=721.62643200&ss=a6b6d691262&mr=1