When a web site says they are your warranty provider that tends to mean they may be/are selling without the manufacturer's approval. You'll care about this really fast if the company goes under or they can't replace the item because they can no longer buy it. If the manufacturer tracks the product by serial number they will know if you got it from an authorized reseller.
Why do manufacturers care where you get their stuff? Controlled distribution is a means of ensuring you're always getting genuine, A-stock new product. Authorized dealers stay alerted to issues, new product announcements, they might get priority tech support, and usually there's a price policy in place to help ensure they make a fair profit. I'm not going to go into what constitutes a "fair" price, but understand that focusing on the lowest price might not actually get you the best deal.