This is a problem that at least a few others have experienced with your microwave and may be the subject of a recall although I could find nothing on their website.
I would definitely go to Siemens first as this definitely sounds like a manufacturers defect. Even if they have not publicly stated this in a recall, they likely know it is happening and may fix it (even out of warranty) if you push. ConsumerReports.org may be interested... I would talk to them if you don't get any satisfaction from Siemens.
Otherwise, the glass should be standard tempered glass that a local glass shop can get if you bring the door to them, or just a sample of the broken glass (for thickness) along with the internal dimensions of the glass.
Make sure that the metal mesh/screen remains in place and is not damaged, as this is what prevents the microwaves from escaping the cooking chamber.
Siemens Customer Support Website
Siemens Service # 1-866-447-4363
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