All of these sites I provided above are legitimate websites managed by Walmart, Sam’s Club, and Costco. And they are using a Secure Sockets Layer (SSL) connection on the order checkout pages along with the specialized digital certificates from Verisign. These technologies will encrypt customers order information and provide the highest level of security for the protection of information transport across the internet so I personally don’t think you should be worried. Yet, there are many different types of internet scams and fraud out there in the web so you should always be wary. You should always check to see if the site you are accessing is legitimate especially if you are going to purchase something online with your credit card. And for your protection, you should never purchase anything online when you are on a public computer or public wifi (especially at coffee shops, cafes, etc.) because your information can potentially be exposed to any hacker in the area.