Not "free" targets, but everything that you would need for a shooting range.

[OzarkPyro]

I purchase targets from Qualification Targets for my shooting range. - http://www.targets.net/ -

They have everything that you'd need for a great range set up, and at reasonable prices. They sell to LE and Military ranges, they have more than just targets now too.

[gkim4107]

That robot they have on the site reminds me of a youtube video I watched once. It was a law enforcement range that had barricades throughout it, and the objective was to teach B.L.E.T. grads to find cover, move and shoot and such. The catch was the robot shot small rubber balls back at you.