Winning a free trip to Hawaii is especially appealing midwinter. And even though the package says in very small type that you don't have to buy the product to enter, you feel your chances have to be better if you do. Wrong! State regulations on contests are very strict and prohibit companies from showing a preference toward purchasers. If the contest appeals to you, but the product doesn't, don't buy it. But do enter the contest. Your chances are just as good, and you haven't bought a product you'll never use.