We do offer additional IP addresses as an add-on in several locations (including Denver, NewYork, London, Germany). In other locations, we do not offer add-on services.
You can purchase additional IP addresses anytime if you have purchased a Windows VPS from the above locations. The cost for one additional IP address is $3.00 / month. You can purchase IP addresses during the sign-up process or later by raising a ticket to our billing department using the helpdesk.