RE: 3D Whitetail target
I have the Delta Backyard buck. Cheap target, I think it was $79 and a new insert is $19. I only shoot it with broadheads right before and during the season. I just shoot into bags for the rest of my practice. I'm not sure any of the targets last if you shoot them a lot.
You can make the inserts last a little longer by picking specific spots around the vitals and not shooting right behind the front leg at the same spot all of the time.