For extra cartoons NOT on the Golden Collection you need
LOONEY TUNES SUPER STARS I'm not sure if they are region free though as I have not got them myself yet.
It's best I direct you here for details on the various releases as there is quite a bit of information..
https://en.wikipedia.org/wiki/Looney_Tunes_Super_Stars
EDIT: Looks like they are Region 1.