The rebates are Vendor Specific. You cannot buy it at Amazon.com, and then send in another vendor's rebate. Computers4Sure seems to have the deal of the moment, since the Amazon.com deal is over, and a good buy.
I told my Brother about the Amazon.com deal, and he jumped on it. It was $10.00 cheaper with Coupon, but $49.00 for a 4 port router with a print server is an EXCELLENT deal.