As I type, the IndieRoyale bundle website is being bombarded by people desperate to get their hands on the Difficult 2nd Bundle, a collection of four games for the low price of £1.25/$1.99.
Nightsky, Fate of the World, Scoregasm and Ben There, Dan That! + Time Gentlemen, Please! can be redeemed through either Desura or Steam or downloaded directly and, where applicable, can be played through Windows, Mac and Linux. Exciting stuff.
The IndieRoyale bundles start with a minimum price and with every purchase gradually gets higher, so you're best to act as soon as possible if you want the games at their lowest. Of course, you could be extra nice and pay above the average, lowering the price for everybody else.
Now, if you'll excuse me, I'm going to go and hit refresh repeatedly.
