The door is available at any of the following websites:
searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com
If the model number you listed this question under is correct, the part number for the ENTIRE door is WB56X10585.
Is there a reason for replacing the entire door? You can purchase individual replacement parts if only a single part on the door is broken. The first three sites on the list have helpful exploded view diagrams to assist you in locating and properly identifying the parts you may need.
The most common thing that fails on these doors is the door handle. If only the handle is broken, the door handle can easily be replaced on most microwave ovens by removing the inner door panel that goes around the perimeter of the glass. The following link explains how to access and replace the door handle:
http://www.fixya.com/support/r3696942-microwave_oven_door_handle_replacementThe average cost for a replacement handle usually averages about $20 - $40. Replacements may be purchased at the websites listed in the link I provided.
The part numbers for the handle on this model are (2 pieces):
WB15X10119
WB15X10120
If you have any questions, please post back with your and let me know. I hope this helps you
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