WTB: Tramps Like US Manga Vol 6 and up

I know Vol. 6 is fairly hard to come by....not a collector here. My GF loves the series and I want to get Vol. 6 for her. So, if someone has these sitting around I will buy them at face value.

Hopefully, there is someone willing to throw a fellow fan a bone here.

edit: actually looking for 4-8, specifically