After tomorrow!
All those corrigated plastic political signs are fair game. They make AWESOME target holders/backing. Get the stick on shoot-n-see or staple on your paper targets. I have been using the "buy your house / wieght loss" ones for the last year or so. They are lite, small and take seriouse abuse.
I had six in use Saturday.
PLUS -
You help clean up the crap that is left sticking in the ground for the next three months.......
Greg