How can i make more money?!?

i'm not old enough to work at a lot of places, and summer is just now starting so a lot of places aren't looking for help anymore. we're having hard times for money in my family right now and i'd love to have more money to buy all the stuff for myself that i don't want to ask my mom to buy for me, when she has a lot to take care of as it is. i've listed some of my old designer jeans and purses and stuff on eBay but you never really know how much you're going to make with that. someone please help! if you know of anywhere hiring in the dallas/highland park area please let me know! also if anyone has any other ideas please share! thanks