Power Grid: Supply Contract (Funkenschlag: Der Liefervertrag) is a promotional card for Power Grid.
The Supply Contract lets you permanently move one step back in player order, both immediately after the card is purchased and each round after player order is determined; hopefully you have enough cash in hand when this card shows up in the power plant draw pile.
For more information: http://boardgamegeek.com/boardgameexpansion/108668/power-grid-supply-contract
Power Grid: Oracle & Industrial Espionage (Funkenschlag: Orakel & Industriespionage) are two promotional cards for Power Grid and Power Grid: The First Sparks.
Both cards give a single player information about the topmost card in the power plant or technology draw pile. After buying a card from the market, the player must give the Oracle / Industrial Espionage card to the previous player in turn order.