When it comes to targets, I am just too cheap to PAY more than I need to. For groups, or sighting-in, I spray red paint through a homemade round stencil onto whatever scrap cardboard or paper I may have around. I picked up a giant 4-ft roll of butcher paper for free, it'll last me for years. Depending on the range, I can make 1-inch, 3-inch, 8-inch or whatever size is appropriate. Shot-up paper goes into the wood stove.
For daily practice, I have round metal "gongs"...1.5-inch @ 25 yards, 2-inch @ 50 and 75 yards, 3-inch @ 100 yards. They are permanently set up so that I can step out the back door and shoot off the deck. I may hit'em occasionally with a can of spray paint if it's handy. They are fantastic for off-hand, sitting, shooting off sticks, whatever. If I do no other shooting at all, I will still do at least one box of .22lr ammo per day in anything other than hurricane conditions. If you have enough rimfire rifles, almost any cheap on-sale ammo will work decently in one of them.
If my granddaughter or some other child is visiting, I will bend my rule about the P-word and get a case or two of cheap off-brand pop cans. When it comes to kids, we're probably shooting in nice summer weather. A well-shaken pop can sitting in the hot sun 'splodes real nice, and keeps their interest. Works better with .17HMR or Mach2. An orange prairie-dog spinner is a big favourite also...but there's that P-word again...