Don’t let the discovery of a great online bargain cloud your judgment. Cybercriminals are renowned for duplicating the look and feel of popular websites. If you are visiting a site you found through an online search — or by a link from an unfamiliar source — be vigilant. Check the domain name to make sure it’s not a knockoff of a familiar site — Deal.Amazon.com for instance, rather than the familiar Amazon.com. Bad grammar and spelling errors are another tipoff. And finally, if the site is not encrypted — you should see HTTPS in front of the site’s web address — do not even consider making a purchase or providing personal information.