Funny you should ask this. This deal has been there for months, at both BB and CC.
Two days before Thanksgiving I walked into a CC next to my work after I got off, the store was empty and the manager walked me up and down the flat panel lane. He convinced me to buy a Panasonic 50" 1080p plasma, on sale for $2399, and he would give me a "10% walk-in discount" and if I ordered DirecTV I would get another $300 off the TV, and also I could get 24-month no interest and he would personally write down a 90-day price match.
So I took the deal, the TV with $2799 MSRP ended up at $1860, I have yet been able to find a lower price today while my 90-day is soon to expire
Later I discussed additional receivers with DirecTV to add on the order, I was told I had to cancel and re-order. I called that manager asked if I could return the TV cuz DirecTV wanted me to cancel the order and place a new order. He said if you canceled DirecTV then could not return the TV anymore, only exchange. The sale was however final, no price change.
I did not want to return the TV at all, just I thought if I canceled D* I broke the contract so I would not deserve the price break on the TV, apparently they did not care, just wanted to make a sale.
I hope that answered your question, your mileage may vary with BB though.
And do so at your own risk