Some are under $100 I like this one...
http://www.dickssportinggoods.com/pr...94&cp=699222#1 You could be creative and hide the thing in a birdhouse. Maybe even inside the building.
My father has been considering trying one, he hunts private property. He is somewhat reluctant as he would hate to trek out there one day to find it gone/destroyed. Its different when you have it at home or a place of business