Yep, as a matter of fact, I have one in front of me that I just received. There are probably 15 or so coupons in it, and included are things like:
Free Seriolithograph from the art auction
Free wallet size photos (4) when you buy an 8X10
Rent Golf clubs, and receive a 2nd rental free
10% off a 2nd shore excursion in the same port
Free cigar when you buy "OX" cognac
20% off spa therapies while ship is in port
10% off your second bottle of wine
Buy a Carnival Cookbook, and receive a Bar Recipes book free
Buy a frozen "foo-foo" drink and receive a Carnival Souvenir Glass free
Several others, but you get the idea. Some O.K., and others you'll never use.
This book came with the docs, directly from Carnival. At other times, we've received them in the cabin. It may be because we're Platinum, (ie: over 10 cruises with Carnival) although it doesn't say anything about that on the book. I've noticed that some agents advertise a coupon book with the booking, but I don't know if it's the same book or not? In any case, it's nice, but not a "deal stopper" for me.
I just spoke to Carnival Cruise Lines on the phone about the coupon book. She said that the coupon book is only given out to certain cruises thoughout the year. She named about 7 but I didn't write them down. Unfortuately they are not available to all Carnival Cruises, mine included. She said have giveaways for t-shirts, tote bags, etc. Oh well!!