Has anyone ever shot a mannequin? I thought about trying to get one, but then found out how expensive those things really are and how infrequently clothing stores get rid of them.
For me, it's junk targets (mostly tin cans) on an old wooden sawhorse. Junky little plastic toys work pretty well too.
That's one of the reasons why private property rules over most gun ranges. Around me, most ranges only let you used "pre approved" paper targets and nothing else. They won't even let you use silhouette paper targets, and they make it clear in the rules when they put "NO JUNK TARGETS" in all caps.