https://www.youtube.com/watch?v=gg-l2KWG1Yw
I used 22x28 colored paper from the dollar store $.60 ea
Cover completely with cheap 2-inch packing tape
I cut thin strips of blue tape, make the x
spray with cheap $1 per can flat black paint from HD or anywhere
then peel the blue tape off after painting
My next batch I'll skip the blue tape x and draw lines or circles with a silver metallic marker
Cost about 10 cents for a 7x7 inch target
PS any paint that contrasts with the paper (you can use white typing paper) works
I'm sure none of you has any old spray paint lying around