Entertainment Book - Most coupons are for Oahu, but there are some for Maui. Besides the coupons, there is a card that other places use a number to punch. They expire November 1. Price for the book starts out about $35 + $5 shipping. By mid-May they are discounted to about $10 + $5 shipping. You can sometimes find one for the cost of shipping by lurking on this and other forums.
Gold Card - This card will get you discounts. For info on the cost of the card and participants:
Free brochures with coupons - You can find the hard copies of these at the airport baggage area and other places on Maui:
They are sale now!! $17.50 is a great price!