If you can find a shot up section of 3D target, they make good broadhead targets. Most of the tournaments I go to have these in abundance, the ones that are really shot up go for free or very cheaply.
This is one was from a mountain goat, between me shooting it and the squirrels hollowing it out it had hole in it as big as a soccer ball. I filled the hole with Loctite expanding form, it is denser than Great Stuff. Filling both sides took a whole can of the Loctite and part of a can of Great stuff. Broadheads pull out of it fairly easily.
The section on the ground is out of a bedded buck like the one in the background, it was my broadhead target for years until I repaired the Mt Goat section.