Related:

• Finman's Bargain Basement Principle: The one you want is never the one on sale.
• Martin-Berthelot Principle Of all possible committee reactions to any given agenda item, the reaction that will occur is the one which will liberate the greatest amount of hot air.
• At a bargain sale, the only suit or dress that you like best and that fits is the one not on sale.
• Baker's Law of Economics: You never want the one you can afford.
• A man is a person who will pay two dollars for a one-dollar item he wants.
  A woman will pay one dollar for a two-dollar item she doesn't want. -- William Binge...
• The item you want is out of stock. But it's on back order.
• A necessary item only goes on sale after you have purchased it at the regular price.
  -- Sherry Gradito...
• No matter how carefully you shop for an item, once bought, it will be on sale elsewhere cheaper.
  -- Lewis's Law...
• For Sale: One mind. Pristine condition - Hardly used.