I built mine for near nothing. I did have to get a coated cable from the local home place. I had the nut, the bolt, the washer and the crimps and used an old sturdy metal broom handle. It's a good way to let little target ones go. Every trapper new or old should have one.
I've had no experience with bobcats, but I have read that they are susceptible to stangulation if using a catch pole to release. Maybe some others with more experience can chime in. I have used my homemade pole for releasing small coons though. Good luck this season.