At the Walmarts near me, the costs are:
6920 $1097
6920 with FDE Magpul furniture $1147 (this is what I purchased)
6920 with black Magpul furniture $1167 (not sure why they are $20 more than the FDE, but they are).
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depends on which Walmart...
http://dsgarms.com/ProductInfo/COLE6920MP-B.aspx
But that's the average price even online.