To celebrate surpassing 100 games in the Playpack, OnLive has put out a promo code good for 50% off any playpass purchase (except for pre-orders).
The code is “BIOSHOCK” and it expires at Midnight.
Deus Ex: Human Revolution would only be $24.99 for example. I wouldn’t use it on anything that might be a $5 Fridays Deal.
Also, if you have an OnLive UK account, it appears you can log into the US client. There’s supposed to be a deal where you can get a game for £1.00. Official launch for the OnLive UK service is September 22. Their library of games will probably be smaller at first.
Make sure to add a credit card to your account first, otherwise you’ll probably have problems checking out and/or applying the promo code.