Where can i get a backpack from?

Hey guys, i am starting year 8 and i need a backpack. i am a girl but i dont like pinky girly things and i need a lot of room. The backpacks at kmart and target are all kinda gay, coz i want a good brand like converse or adidas or nike. something like that. it needs to be around $50- $60. i tried ebay but i cant find anything good. also i went onto the converse websit but they dont have anything. Thanks guys(: