me and my cousin just used sheets of styrofoam insulation and cut them to about 2-2 1/2 feet wide and stacked them untilwe thought it was tall enough and put a rachet strap around them and tightened it up. i dont have a picture right now. you can probably get some at lowes or someplace like that. they do pull kinda hard so i put some silicon stuff on my arrows and it works better.