I seem to have this awful luck where so many times when I am off from work and looking forward to a little Rush, I get a darned fill-in. I don't know how many days off Rush takes, but I feel like I find em somehow. I am not a 24/7 member, but i listen to the free clips on his site.
If you have a broadband connection, you can buy a program called Replay Radio; it allows you to record an internet feed of Rush (or any other program streamed through one of many free feeds from various radio stations), and listen later.