Targets can be made from anything, look below and see the many things you are throwing away that you can use.  What's nice about all these things is they make a neat sound when they hit the targes, and it's easy to count the peas inside if you are going to have contests and see who's the best shoot.

A milk jug with a tin pie plat works really great, counts the peas you get inside and it makes a really neat sound.

These are male urinals, use them like this, paint them, or put a pie plate on them, easy to count the ammo going inside to judge contests, pie plate makes a really neat sound.