There are a lot of very bad internet camera retailers out there, with "too good to be true" prices, on which the camera is in-stock only if you buy a bunch of really overpriced "accessories". As reef_doug said, some of these places are also Grey-Market importers. Canon/Nikon won't take these cameras in under warranty, instead you must deal with the store. This isn't a problem with reputable stores like Adorama or B&H (who also sell Grey market items, but market them as that explicitly), but for a shady internet outlet it means you're out of luck.
Dell is of course good, so is Amazon. On the upper end B&H Photo-Video and Adorama are good picks.