Saving money with common sense
-Movie theatres make all their money from concessions.
-Big-chain electronics retailers are pushed to sell the warranty on big ticket items. Even the "commission-free" Best Buy, which gives bonuses to the managers who sell the most service plans. Screen cleaner, wall mounts, HDMI cables and audio cables should all be purchased online and not at the retailer that you purchased your tv from. I remember seeing the at-cost price for screen cleaner at 2 dollars while it was selling for 20.
Any other ones?