These links may help you to choose a Certificate Authorities to purchase from. Note that there are plenty of resellers that sometimes offer discounts. You may wish to try eWay, SecurePay or your domain name supplier.
Saving money on SSL certificates:
http://www.sslshopper.com/article-top-10-ways-to-save-money-on-ssl-certificates.html
Compare issuers:
http://www.sslshopper.com/ssl-certificate-wizard.html
http://www.sslshopper.com/free-trial-ssl-certificates.html
Purchasing a certificate:
http://www.sslshopper.com/how-to-order-an-ssl-certificate.html
