Looking for good slasher movies from late '70s and early 80's

[glennstl]

I've just gotten into slasher movies on Blu thanks to buying the complete Halloween 15 box collection. The first two are great, as far as setting the standard. Also a big fan of the Friday the 13th movies, at least the first 4 or so.

I'm asking for opinions of good slashers from this period that are currently on Blu.

So far, I've also seen the following:

- Prom Night ( liked)
- The Town That Dreaded Sundown ( pretty cool)
- Final Exam ( wanted to like, due to th college campus, but not a huge fan)
- started watching Graduation Day and New Year's Evil on Amazon Prime to try them out...but they seemed really cheaply done and poorly acted. Granted, I only watched probably the first 20 minutes of each, so maybe I need to give them another shot?
- Sleepaway Camp ( absolutely love the original....and the ending! )
- The Burning ( awesome movie...liked the Friday the 13th camp vibe)
- Terror Train ( liked a lot due to the mystery and the train setting)
- Funhouse ( enjoyed a good deal)
- The Prowler ( currently watching right now)

Any other slasher recommendations on Blu from this same time period? I'll take any decent ones too. I'm especially interested in any opinions about one's a I haven't seen that might be considered " must see".

Thanks!