Ideas on how to get money?

Why dont you babysit? or help an neighboor do chores or clean up the yard by raking up leafs or shoveling the snow? I'm going to Washington DC for my 8th grade trip on May 23rd-26th. My grandmother payed for my trip but you can save up money for that. Right now i'm trying to save money to buy stuff in DC but its pretty hard not to cuz i'm a girl and you know girls are all shopaholic haha. But why dont you try these??