I really need help, some advice, my parents are going to kill me...?

This morning juice spilled in my bag and I mistakenly threw out something that I need that costed me 70$ (a recite) in the school garbage bin. I really need advice!! Do you know if the school throws out garbage over night? I was so irresponsible my parents will be furious... I wouldn't care so much if it wa my money spent but it was my parents!! Please I'm crying like crazy and freaking out. Help?!