I don't like TheBuzzers thread so I make a better one with more info 
http://store.steampowered.com/app/8980/
Borderlands - $4.99
Borderlands GOTY - $7.49
Borderlands Four-pack - $14.99
Boderlands GOTY Four-pack - $22.49
All DLC - $2.49
http://store.steampowered.com/app/8980/
Borderlands - $4.99
Borderlands GOTY - $7.49
Borderlands Four-pack - $14.99
Boderlands GOTY Four-pack - $22.49
All DLC - $2.49