I do hog and varmint control on several properties, one of which includes trying to keep the beaver population down so that the small lake doesn't back up and create a swamp 3 times as large. The beavers want the swamp. The landowner does not.

After beaver hunting, I headed across the road to look for hogs, but the hogs were not on my property to hunt, but there were a dead cow and coyotes...

Good shooting. Get those critters.

how much does one of them scopes/thermo's run?
and what is the magnification on them as options?

Typical commercial thermals for the civilian market run between $1800 and $9000. Base magnification ranges from 1x to 6x.