Heres what I used to do for money when I was 10-11 years old, around the fall/winter I could get packs of greeting cards from last year and have like 50 christmas cards, I'd buy bags of hershy kisses and bag 3 of them, with 3 greeting cards, sell them for a dollar, I made 20 dollars a month doing this 1-2 days a week.
20 dollars ment alot back then to me, now I have a real job, a paycheck of 300 dollars seems low.
Ye olde carwash.
Kids with gravel-y sponges and cheap dish soap make surprising amounts of money.
Thousands of years ago when I was in high school, they made us sell Riversweet Citrus to pay for our trips. Nothing says love like a grapefruit. V_V
Get bikini girls to stand and hold signs for car wash
Car wash is clever/
edit: rofl in the winter, standing in a bikini....freeze to death :/