Google Play is hosting their "A Rock and a Hard Place" promotion that puts nearly 100 Rock, hard Rock, Industrial and Metal MP3 albums on sale for $3.99 to $7.99. We're talking Marilyn Manson, Faith No More, Rob Zombie, Ozzy Osbourne, Iron Maiden, and many, many more. And be on the lookout for Amazon price-matches if you prefer that avenue, they almost never fail to respond.