Related:

• The one item you want is never the one on sale. -- Finman's Principle
• Irregular verbs are on sale in the bargain basement.
• At a bargain sale, the only suit or dress that you like best and that fits is the one not on sale.
• Speaking of purchasing a dog, never buy a watchdog that's on sale.
  Everyone knows a bargain dog never bites!...
• Speaking of purchasing a dog, never buy a watchdog that's on sale.
  After all, everyone knows a bargain dog never bites!...
• Baker's Law of Economics: You never want the one you can afford.
• Homer: All done. Marge: You're not done. I want you to throw away these old calendars and TV Guides.
  Homer: Are you mad, woman? You never know when an old calendar might come in handy....
• For Sale: One mind. Pristine condition - Hardly used.
• Cats seem to go on the principle that it never does any harm to ask for what you want.
  -- Joseph Wood Krutch...