the best idea has already been said...mow lawns, clean gutters...etc. At 13 I had a car detailing business. I hated to mow lawns, well i liked that part, but the cleanup sucked...so I started washing cars. Before I knew it my dad opened a business checking account for me and we invested in some better tools to do the job and he bought me business cards. I even had a couple of friends who I paid to do work for me because they were older and they could drive. Not that you need to go to such lengths to save for a $700 monitor, but you could wash cars. In my busy schedule I wish some kid would run by and ask me if they could wash my car in my driveway!