Gamblers Remorse by Pat Fallon
Gamblers Remorse is one of my favourite tricks to do. It's self working, so there's no moves to worry about. It's incredibly commercial, and any presentation where the spectator thinks that they stand to win some cash is automatically appealing.
Of course, your prediction is always correct, and always matches the card in the keyring (regardless of their decision at the end) and everything is left clean and examinable - the keyring, the wallet, and the deck are all totally clean.
Includes routine and instructions, gorgeous leather wallet, lock, keys and laminated prediction card... you just supply (or borrow) a regular deck :)