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Publish your app(s) in the Windows Store and/or Windows Phone Store from March 8th to June 30th, 2013.
Enter up to 10 apps per Store and get a $100 virtual Visa card for each that qualifies (up to $2000*).
---- So, if you own the XNA module you can get a Phone App out, or maybe HTML 5 export will be out in time. One or two submissions and you'd cover your cost of the export module.
-Steve