You do not need to purchase an IP address. Our servers utilize SNI (Server Name Indication) technology that allows SSL without the added expense of a dedicated IP address.
"Server Name Indication (SNI) is an extension to the TLS computer networking protocol by which a client indicates which hostname it is attempting to connect to at the start of the handshaking process. This allows a server to present multiple certificates on the same IP address and TCP port number and hence allows multiple secure (HTTPS) websites (or any other service over TLS) to be served by the same IP address without requiring all those sites to use the same certificate. It is the conceptual equivalent to HTTP/1.1 name-based virtual hosting, but for HTTPS. The desired hostname is not encrypted so an eavesdropper can see which site is being requested."
Quoted from Wikipedia