Purchased one of these last week
http://www.actiontargetbeta.com/store/featured-products/at-rimfire-sport-dueling-tree.html
I researched these and the "cheap" ones had a lot of bad reviews that they fell apart after several hundred rounds.
I dragged a mess of kids (9, 11, 13) and .22 pistols / rifles out on Friday night and we shot and shot and shot. The kids liked the challenge...they shot against each other (sudden elimination and based on #of shots) then we shot teams (they took turns being with me) then all 3 teamed up and shot against me. In about 90 minutes, we went through a 550 round Federal value pack. They were absolutely delighted and were really disappointed when we were out of ammo.
In that short session I think they learned a lot...1) shooting fast doesn't compensate for missing the target, 2) long guns are a lot easier to hit with than handguns, 3) don't discount the man with a lever gun...he can often keep up with a tricked out seni-auto, 4) you might be able to hit every shot in practice but when it's man-against-man, somehow those hits turn into misses.
After shooting, we made our traditional stop at the convenience store to buy a pop (for the last 10 years, I have never failed to stop and get a pop after shooting) and then we met my wife and went out for Thai food.
I wish I would have taken picutres but we were having too much fun. Best $120 I've spent in a long time.