Too good to be true. Back in September (at least in Los Angeles) the three company-owned stores were selling them for that price ($99). Now they are being sold at the straight retail price ($199), the same as you would pay at Best Buy or Frys or anywhere else that sells the AC68U at retail.
But, the people at the three company-owned stores I spoke with each told me about an unbelievable deal that is still being offered:
If you already have a T-Mobile account (or sign up to get one), you can pay a one-time fee of $25 as a deposit, and they will give you an AC68U (Magenta branded by T-Mobile with a "cell spot" for texting and calling with wifi), and there will be no other charges, not even a monthly fee. You get to keep the AC68 until you cancel your T-Mobile service or you decide to return it. Oh, and when you return it, you get your $25 back. So if you're already a customer, it's basically free.
Apparently this deal is only offered at company-owned stores. In Los Angeles there a tons of smaller unaffiliated independent stores that sell T-Mobile and will pop up in Google if you search "T-Mobile Stores". However, none of the independent dealers I spoke with had the router nor did they know anything about the program. I had to Google "T-Mobile Company-owned stores" just to find out that there are only three of them in all of Los Angeles, and they all had the routers in stock and knew about the program.
Sadly, I'm not a T-Mobile customer nor do I have plans to switch from my current provider any time soon. But it's a terrific deal if you're already one of their customers, or looking to switch carriers.