Here is the med for the gape worm. This is the cheapest way to go, it is a pour on. .5ml per 5lbs of body weight.
http://www.tractorsupply.com/en/store/iver-on-250-ml-cattle-pour-on-medication, this is from TSC
http://www.tractorsupply.com/en/store/iver-on-250-ml-cattle-pour-on-medication, this is from TSC