Having originally bought this game as a gift for a friend, I've thought about buying my own but never quite pulled the trigger. I've never really seen it on sale before, it's always been $59.95. They've now got a 30% off Mother's Day promo along with free Express Shipping (normally it's free standard shipping).
The story goes that KLOP (or Molkky as its originally known) was invented by Finnish lumberjacks as a way to break the silence of the forest.
You can find a detailed review here:
https://boardgamegeek.com/thread/545590/klop-molkky-detailed…
Or for a quick overview this videos is probably what you want:
https://youtu.be/lIdWY9gPqhE
Yes, mölkky is addictive. Best played with friends over a couple of beers at a summer cottage. Saw Finska at a uni shop one day and had a laugh.