Coach iPhone covers can be purchased online at the Coach website. These products are also offered at online retailers such as Amazon.com and eBay and stores that sell other Coach products such as Bloomingdales.
The difference between the number of sites that offer a Coach iPhone case is that the Coach website offers a wider variety than the other sites simply because it is the company that produced the cases. When dealing with eBay, there are some cases that are still in their original packaging and others that are being sold third person and have been used. The quality of those cases may vary as a result.