Here in the states, they're not as rare. But still very valuable.
I payed $3,600 U.S. for mine and it's not in great shape.
I saw a few for 2 and 3 times more while I was searching.
Running and original...I'd say $4,000 without a second thought.
BTW the '83 and '84 is called the KP62 here.
This is my '81 KP61 with transplanted 4A-GE engine. It has a rough street value of 5K plus in its current state.
Most interested parties here are Puerto Rican or from the Caribbean.