i use http://www.johnsonstelemetry.com/
for their collars and i use a wildlife box http://www.wildlifematerials.com/
I use these on bear hounds and iam not sure of what type of application your looking but these work exceptionally well for me.
there are others that you may find easily on most search engines, magnum telemetry, quicktrack,and, wick outdoor works carries a line of tracking collars as well.Hope that helps you out!
When it come to turkey calls some of us have only one or two. Then there are the ones that have and can't go in the turkey woods without at least a dozen or so. Remember that old calls still work. Just take a little time and freshen up your old style calling tactics.There are most likely more than a hundred types of turkey calls out there on the market. Just waiting for you to pull out the green and spend it on them. From Hunter's Specialties, Lynch, and even the famous Drury brothers calls...