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How to prevent myself from buying things I don't want
Make a deal with yourself. You can buy the things that you want, but only after you've read three books on behavioral economics. You should probably start first with Dan Ariely's Predictably Irrational, which will help you understand why the discount makes you covet the products even more than you would without it. Then find and read two more high-quality books from the same genre.  If you gain self-awareness from this, you will begin to understand why you are conflicted (hint: you really don't want the things you think you do). And you probably won't purchase anything in spite of the fact that you kept the first part of the bargain.