iTunes appears to be having a sale on the top Metal Albums in iTunes, including Metallica’s "and Justice For All", "Ride the Lightning", as well as other bands such as Avenged Sevenfold, Disturbed, Pantera, Black Sabbath, Slipknot, Megadeth, etc. The link below is just one of them, but if you go to the main iTunes page on your phone, and scroll down the music page, there is banner that says "Metal Albums from $4.99".
https://itunes.apple.co
Some really good albums in there for the price.
https://itunes.apple.com/us/album/and-justice-for-all/id579142900
https://itunes.apple.com/us/album/ride-the-lightning/id579148345
https://itunes.apple.com/us/album/avenged-sevenfold/id266023781
https://itunes.apple.com/us/album/the-sickness/id1030601019
Updated with the accurate link