50-250 USD or so
The Mark II was made between 1966-1980 then came adjustable power made between 1981-1986. It's current value is Apx: 100%=$135, 90%=$85, 60%=$50
If in good condition I would say used...$80-125, new they are selling the local walmart for $126. Now the new version with the accutrigger, I would say a good deal would be $140, but could sell for...
100-400
75-175 dollars