Hadn't occurred to me to use cheap paper plates. I made a plywood template, and I cut up every cardboard box that comes my way into 12 x 14 rectangles. Three of these clamped to my target frame in a stack will accept and retain pushpins, so I now just scribble a target with a marker on 8 1/2 x 11 printer paper and pin it to the cardboard. The cardboards last for 5-6 range sessions.
But I like the paper plate idea. Stiffer, so the wind won't flap it around if one of the pins comes loose.
Just was at the range this morning, and saw three 8" diameter shoot-n-see targets on a frame, which somebody left behind. Not a single hole in any of them. Wish I could afford that!