I don't go to Hawaii without an Entertainment book in hand -- and then get the rental car coupon book as well.

The grocery coupons pay for the book by themselves in Texas and other locales. The AA 5% and rental car coupons can be great savers as well.

The online discounts and coupons are often overlooked, so use the website after you have purchased a book. You are not limited by the location that you purchased.
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Note on Restaurants.com / Theidealmeal.com offer for purchase -- you can go through the redemption process, and upon checkout, you get the browser error message for pages not found. You must go back to that homepage (after writing down your certificate # and register, and THEN select. The cart may not show your value until checkout, however. Yes, you may normally buy the certificates for $10, but free is free this time.