*palletes (previously mentioned how to get them: get some thick cardboard and place it in the pallete to cover the holes)
*old barrels or drums(these are great because no matter how you rotate them they always provide the same amount of cover because they are circular)
*ply wood(shape it in a "V" shape or "X" shape. If youe put a pole up from the X shape bunker, you can have a flag station. Also regular boards standing straight up are great too.)
*mound bunkers(just dig up a heep of dirt so you can lay or neal behind them)
*spools(telephone companies might give these away or maybe sell them for a low price. They work really well but i have not been able to get some)
*hay stacks(they only cost like 4$ a paice and are pretty big...the spools of hay are even better but harder to transport.
well those are all the ideas i have rigth now...make sure you ask before you take some of these things cause we got in trouble for taking a pallete from home depot.