-Afaik, you are allowed to sell/buy here as long as you don't advertise any outside links (this rule has been changed a while ago if I'm not wrong).
-You might find some people in-game testing their own vip ones, maybe if you ask them, they would sell you a copy. This DOESN'T mean they are trustable, ofc, try at your very own risk.
-Apparently you can be HID banned, I don't know under which CF versions nor why you would end up in that situation, though.
Check these: Thread 1 Thread 2