Getting a SSL certificate is quite necessary when you are dealing in e-commerce. This purely authenticates your goodwill to the end user. Most of the online shoppers are updated and when they don’t see a padlock (SSL certificate) authority they prefer to opt out of the purchase. I would advice you, to not take too much time and make a fast decision on this one, as if your certificate is already expired, you would be losing your valuable customers. SSL Star will be a good option as it partners with Thawte, GeoTrust, Rapid SSL which are among the best ones and you can consider it to
buy SSL Certificates for better prices.