The Comodo Positive Multi-Domain SSL certificate is the cheapest one of multi-domain certificates. The cost of each certificate includes the protection of 3 main domains and an unlimited number of subdomains. For an additional fee, you can add up to 100 primary domains. It is an ideal solution for small commercial companies that need to secure several sites at once.
Compatible with 99.3% of browsers:
Chrome 3+(and higher) Opera 7+(and higher) Safari all browsers
Firefox 1+ (and higher) Netscape 9+(and higher) IE 5+(and higher)
AOL 10+(and higher)