From the journal of Mr. Neil Gaiman:
If you'd like to read one of the Sandman parody issues of Cerebus, Dave will send you one. He'll send it to you very happily, free of charge. He will sign it for you, too. And he won't charge you a thing. Not even postage.
And if you're wondering what the catch is, it's this: Dave wants to know (as, I have to admit, do I) how many of the people out there in internet-land will actually go and do things that don't involve passively clicking on a link and going somewhere interesting. So what you have to do is write Dave a letter (not an e-mail. Dave doesn't have e-mail) telling him that you read that he'll send you a signed Cerebus, and telling him why you'd like him to send you a copy. It's as easy as that. And, quite possibly as difficult.
The address to write to is:
Aardvark Vanaheim, Inc
P.O. Box 1674 Station C
Kitchener, Ontario, Canada N2G 4R2