Dallas Gun club. Same deal with membership. Might call Elm Fork. Scott might have one there, not sure.
He used too and it was on the pistol/rifle side all the way at the far end past the check-in house. Good idea to bring your own paint because last time I was there he didn't have grease and someone had painted it...that's been a few years though.
Most clubs will have one if you can find someone to take you. The other option is to get some butcher paper and cardboard with two stakes...drive stakes in ground and then use bailing wire to wire the cardboard to the stakes...then either use big paper clips or tape to hold the butcherpaper to the cardboard.
Good luck, if I wasn't wrapped up the next few weeks I could take ya to Terrell Gun Club and let you use theirs.