You can also buy SSL certificates from CA authorized re-seller. Here is a list of some well-known SSL re-sellers sell a range of same SSL certificates at a much lowest price:
Namecheap.com Cheapsslshop.com Cheapsslsecurity.com SSL2Buy.com and more.
Where Comodo standard SSL certs are available in the $6/yr. range and Wildcard SSL certs start at $40/yr and go up. Certificate pricing is applicable on 2 years SSL certificate validity purchase from authorized re-seller.