Comcast will be giving away a limited supply of free Wiis in an upcoming promotion, a current employee tell us. The offer is good for new Comcast triple-play subscribers signing up July 28-August 17th in select markets. Our tipster confirmed the promo will be good in Miami, San Francisco, Houston, Denver, Chicago, Philadelphia, Boston, Detroit, and some other markets too. In valid markets where triple-play is not available, double-play subscriptions are eligible.