The above link is for Half Life (both 1 & 2 and all of the expansions).
The Victoria collexion includes 1 and 2 and all bar the latest DLC.
http://store.steampowered.com/sub/29109/
Just a warning, Paradox Studios games are designed for filthy casuals, so if you are a member of the glorious PC gaming herrenvolk, stay clear ;)