I used to carry a small Styrofoam target just for the decocking shot. I believe the bolts I bought are made of some type of cellulose material. They require no tip and are just shot into the ground and left to decompose. I can decock my crossbow from the stand. Before, I had to take it back to my mobile home in a hard case and then fire a field bolt into the styrofoam target. That bolt was junk from then on. I forgot their price. Not dirt cheap and a one time use bolt. But in the context of how much I spend on hunting, a mere drop in the bucket. The convenience factor for me outweighs the cost. If I xbow hunted 30+ times a year I would find a different method of decocking the crossbow. I hunt 6-8 times with the crossbow and all of that is based around the rut.
So bottom line, use what works for you and fits into your budget.
So bottom line, use what works for you and fits into your budget.