We are going to be signing up for Directv at the end of July. We have never had it before and will be getting the dish, installation, dvr receiver and an additional standard receiver. My sister and her husband just finished their contract with Directv and gave me their 4 standard receivers (that they own) to use in our house. Now, I know that the receivers use access cards, so can I purchase new access cards for those 4 receivers so I am able to use them as well? What can I do so I am able to use these receivers as well? Is it even possible?