exploitation movies

I have been a lifelong fan of horror and lately have come to appreciate the exploitation sub-genre. I have been hunting down and purchasing as many exploitation films as I am able to find. My list is rather short and perhaps even amateurish, but I am new to the genre. As it currently stands my list of exploitation films includes:
I Spit on Your Grave
Cannibal Holocaust
Last House on the Left
Thriller: A Cruel Picture
NEKromantik
Men Behind the Sun
The Hills Have Eyes (original) (this is a dubious classification but it does employ rape and extreme violence so I included it)

Like I said my list is rather short and some like the Hills Have Eyes might not even count. Would Texas Chainsaw Massacre count? I could see how some would include it and others wouldn't. I have been trying to find other movies that fit into the genre. Salo I have all but given up on. I am hoping Cannibal Ferox gets re-released sometime this year (I heard rumors from Grindhouse Releasing that this was a possibility). The August Underground movies, etc... I have not been able to locate. So does anyone have any suggestions for good exploitation films from the 70's/80's that I could hunt down and watch. I know there are similar threads all over these boards but I have had trouble tracking them down for some reason. Thanks for the help.