I made my own sets of bi-pod sticks out of some cedar, some nylon parachute cord and a large bolt with a wing nut. I made them to fit me for when I am sitting on the ground, and I have a second set for when sitting on a chair in one of my blinds. If you practice with them, it will shock you how steady they are and how much your accuracy improves over free hand.
I was sitting in a tree stand blind a few years back with a Renegade. I had a small doe come in to a thick area and stand there, and stand there. I put a range finder on her and she would be dead if she had been in the open. Then she stepped to an area where her kill zone was open from the tree on the ground she was behind. That was her wrong move, and although the opening was small, off the blind I knew I could have shot her. If it was not for the fact I was waiting for her boy friend or Daddy to show up she'd of been freezer food.
I now cut a Alder stick for a walking shooting stick. I want to smooth it down and then cut it to length. I have tried shooting off it, but like the bi-pod much better.