How far back are you thinking? I got a couple of years worth, and frankly, although they are a good read, I predict I'll never use them again. I just keep re-upping the subscription because I can get it for half price by splitting a gift subscription with someone.
And because they are still a good read the first time through. I just find that I can get pretty much the same information here, as I can in the mag.
PM if interested.