wheel - 3:00 pm on Dec 18, 2010 (gmt 0)
I'm not certain this is a widespread phenomena yet, or ever will be. I also suspect the example given is an outlier. I doubt you look at most $200 bestbuy products and find them at $100 somewhere else.
The people that do this are the fatwallet folks, anxious to waste 8 hours of their life in order to save $3. That's not the majority of shoppers. It may not even be a noticeable minority.
The quote is talking about an impulse buy only.