Look into the Bottle – G Sparks

You borrow a quarter and place it in the center of a napkin. A spectator holds this over a shot glass you filled with liquid from a small bottle. The audience looks at the bottle and clearly see that it is now empty.
Spectator is asked to drop the coin into the glass where it vanishes while there is a sound coming from the bottle.
The coin can now be seen in the capped bottle.

Uses miniature plastic bottles.

A fun little trick that does not break the bank.