you absolutely need an SSL Certificate for an e-commerce site ! It is your responsibility to make sure the information you collect from your customers is protected and will ensure that no one can intercept and misuse their personal payment information.
SSL means Secure Socket Layer it's used to secure websites so that third parties cannot intercept information transferred between the customer and your website. So an SSL certificate gives your customer a satisfaction and reliability on your online store. SO an SSL certificate is definitely needed for an E-Commerce website. You can get SSL certificates at low cost from www.Tucktail.com all the best mate.