For the PT with Hunter I would go to Sports Authority and buy the Everlast MB's that are sand filled. They are smaller, some around the size of a softball and are pretty darn inexpensive. Because they are smaller they work great for that 1 arm 1 leg catch throw stuff. I bought several different sizes when I was doing my shoulder rehab. I also bought some really cheap ones at a TJ Maxx for my wife and her girls to use. they are a little bigger than a softball and weigh 4 lb's. They do a ton of throwing stuff from a crunch position, rotation and anti rotation.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin