GlobalSign SSL Certificate

GlobalSign has been around since 1996 and is now part of GMO Internet Inc.  It has 128 and 256 bit certificates for single domains as well as wildcard SSL certificates to secure subdomains.  They also have multi-domain certificates and offer Extended validation.  The annual pricing when your purchase 2 years is below.

Domain SSL
Organizational SSL
Extended Validation SSL
DomainSSL Wildcard
OrganizationalSSL Wildcard
UC ExtendedSSL
UC OrganizationalSSL
UC DomainSSL