Green Day‘s fourth album, Insomniac, was a darker affair than its predecessors but is considered by some as the album the Californian trio has never bettered. Right now you can download the brilliant Insomniac for $5 on Amazon.com.

Before they got all political and tried to stick it to “The Man,” Green Day wrote impossibly catchy punk rock. Songs like “Geek Stink Breath” and “Walking Contradiction” for a long time defined their sound and were hugely influential to the genre in the mid-90s.

Every month Amazon reduces the price of 100 MP3 albums to only $5. The deals run out at the end of the month, so if you want an MP3 copy of Insomniac at this price order before December 31, 2011,11:59 PST.