I already mentioned this in my Fry's thread. Only the HOU ad had it listed at $49.99 and it's very likely a typo. The giveaway is the "Everyday Low Price" icon below it. It should have been advertised at $59.99, but someone goofed. It seems to happen a lot during the holiday season.
Of course, even if the HOU stores don't honor the price, you would have a fair shot at a PM.