Report Abuse. Buying a green card is illegal no matter who sells it to you. All it takes is a couple of phone calls by Prosecution Officers and they will find that the person who bought such a card has no real Immigration history and they will be prosecuted.eport Abuse. Buying a green card is illegal no matter who sells it to you. All it takes is a couple of phone calls by Prosecution Officers and they will find that the person who bought such a card has no real Immigration history and they will be prosecuted.