I used cardboard for my target. It can be picked up free if you want to put the time in to collect it, or you can order it from someplace like ULINE. Stacked on a frame with the 'ribs' or corregations facing the shooter, threaded rods on the side to compress it, it works great. I have had mine for about a month, shot it almost daily and can hardly tell it has been shot at. Like other stacked materials, it can be shuffled around if one area starts showing wear, or if you want to shoot broadheads for awhile. I ordered my cardboard and have @ $120 in my target--30" wide, 32" tall, 12" thick, wheels on the bottom to roll it around on. Better than any block, bag or cube I have ever used. Including the ones with "self-healing" foam(LOL).