In Harmony - compilation albums - was created in 1980-10.
Other compilation albums of Westlife was created in 1999.
Studio Albums: 4 Compilation Albums: 1
7 studio albums 2 compilation albums 4 video albums.
Ensiferum have released 5 studio albums. They have also released a compilation which is made up of their first three demo albums. So in total they have released 6 albums including this compilation.
They have 9 studio albums, 1 live album, and 3 compilation albums.
You're talking about compilation albums. They're sold on various websites, but, as far as I know, there isn't a website or label dedicated specifically to compilation albums for Metal bands. Dwell Records has composed a number of compilation tribute albums, and many labels will compose their own compilation albums as a sampler of the bands they have in their lineup.
Studio Albums - 9 Live Albums - 4 Compilation Albums - 8 Singles - 22 Video Albums - 9
Teena Marie released 13 studio albums and 7 compilation albums.
13 Platinum (or multi-platinum) studio albums; 2 platinum (or better) compilation albums.
The Killers have three studio albums and one compilation album. They are:Hot Fuss (2004)Sam's Town (2006)Sawdust (2007-Compilation)Day and Age (2008)
Weird Al Yankovic has released 13 original albums, as well as 6 compilation albums.
Stoneage - compilation - was created in 2008.