There was probably some planning and intent to get extra store foot traffic when BBY decided not to email out a corrected coupon (only post something in their forums).... or remove/update the original email link or pdf... and their method of communication to the customer is a print out at the register... Sounds like they wanted to try to make the most out of a bad situation.
That is still not considered bait and switch. It is called a major f*ck up by some marketing dude/duddette at corporate. These type of deals are only bringing in the devils that BB is trying to avoid.