I just had a garage sale last Saturday to raise money to buy us a saddle and we made $175. :) It was great. We also had a little info on what we were raising money for, a pic of me and Miss Take, and a donation piggy bank. It helped that people knew what the garage sale was for.
If you're looking for a job, libraries often have a student position. My sister is in highschool and works at the library. It pays pretty well, too. ;)