Red's money saving tip #354: Postage stamps.
You will need:
(1) Some postage stamps
(2) A white candle
Instructions:
(1) Carefully place the stamp on the envelope or package, remember that the Queen's head faces upwards, not the sticky part.
(2) Rub the candle on the face of the stamp, covering it in (invisible) wax residue.
(3) Post the letter/parcel.
(4) When the letter/parcel arrives at its destination, rub the postmark/candle wax off the stamp.
(5) To re-use the stamp, go back to (1) above.
This is for information only, do not do it, as I'm sure it's illegal.
So there.