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BestBuy.com [bestbuy.com] currently has the GoPro HERO4 Silver for $ 329.99. You also get the free 64gb SanDisk Extreme PLUS microSDXC ($ 50-55 value).
Pretty good deal IMO.
Amazon currently has it for $ 329.99 with no other offers.
Combine it with 5% Cashback if you have a Discover card.