As mentioned by the @nbajam twitter feed, you can now purchase NBA JAM: On Fire for 800 Microsoft Points, from now until Valentine's Day, February 14th, exclusively for Xbox Live Gold members.
HE'S ON FIRE! NBA JAM: On Fire Edition from EA SPORTS™ is heating up and available for download! NBA JAM: On Fire Edition is everything you love about NBA JAM, dialed up to 11! Featuring bigger rosters, 30+ unlockable secret teams, legendary players, monster dunks, all-new online modes, and so much more. Of course, the voice of NBA JAM – Tim Kitzrow – is back with tons more original commentary. Download today, you’ll be on fire in no time!