No, it's not possible to buy a dedicated ip address. A dedicated IP address is an IP address that is associated with just one user. This IP address is not shared with other users. However: Versio has deployed an update which makes dedicated IP addresses no longer necessary for our webhosting and reseller accounts to install SSL certificates.
If you have a cloudbox VPS and you need a new ip address then you can purchase a new box on your cloudbox in our customer portal. Every new box that you purchase gives you a new ip address which you can use for your cloudbox VPS.