frontpage - 9:43 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.
Here is a an example from the Best Buy website that took several seconds to price check with a large price saving from purchasing it elsewhere.
Mitsubishi WD-65638 65-Inch 1080p 3D-Ready DLP HDTV
Best Buy Price: $1,299.99 + free shipping
Amazon Price: $1,098.00 + free shipping
Price Savings? = $201.99 for a few seconds of work. Almost pays for the smart phone. I can provide many other examples if you want.