Costco's deal is better if you want a good zoom lens.
D3100 with 18-55mm lens + 55-200 mm lens + 4GB SD Class10 + Bag = $750 + Tax
Not a better deal, that 55-200mm isn't great, but ignoring opinion it is commonly sold for $150 (many posts here on SD) - so that puts the Costco deal at almost $600 for the camera and 18-55mm (4GB SD is cheap, bag is worth some, so say still over $575).
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