Buy yourself a cheap pump up airgun, set up some targets in the back yard and fire a few shots off when ever you want to. It doesn't take long to see that the mechanics of marksmanship is just as important at 10 yards as 100yds.
I shoot clays in the back yard and have a backstop to where I can shoot any gun I own off of my front porch. That being said I shoot my airguns daily just for the sheer fun of it. Little noise, easy to secure pellets/bb's to eliminate danger of fired rounds (traps, etc) can be shot most places...
$10 for 500 pellets is a plus also
Just remember that cheap equipment seldom is as good or nice as more expensive gear. One can get addicted to airguns real fast and $150 is just the very bottom of what a decent one will cost. Good luck and have fun
