Spend the $8 and get a slingshot. They are fun and easy to use. Spare rubbers are plentiful, or buy surgical tubing in large rolls. When I was a kid I got a couple of gallons of marbles at a yard sale and killed many squirrels with a wrist rocket.
If your model folds, you will carry it with you more. They are also easy to make and check out some of the flat band models people are making, using medical rehab material of various strengths for the rubbers.
So what if it takes practice. Few skills don’t.
Your #57 was a good post.