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The way to find out which store is selling what gizmo at what price is to read the Black Friday sale ads that come out the Sunday before Thanksgiving. These ads do leak out long before that Sunday and many websites make it their mission to find, scan and display these ads for us cheapos to devour weeks before that special Sunday gets here.
I don't know where they get these ads so far ahead of time, although I do suspect that many of the sources are the stores themselves, who arrange to have an ad posted on the site to build buzz and potentially raise sales when Black Friday arrives. I'm not usually a conspriracy guy, but...
Go to blackfridayinfo.com here to plan out your strategy. Good luck!