There’s a new promo code out for OnLive. It’s good for 50% off any game excluding pre-orders.
The promo code is TOTALLY50
Use it to get Batman: Arkham City for only $24.99. Playpack subscribers can stack their discounts, so the game would end up being only $17.49.
Great games to use it on would be Saints Row: The Third, L.A. Noire, Orcs Must Die!, etc.
I don’t know when the code expires or if it’s valid in the UK unfortunately.