I'm currently 15 years old and would like to invest in physical objects, not the stock market or bonds, and am looking for some guidance or suggestions. I would like to see a return within 3 months of my monies. Please don't say anything I need my parent to sign for or buy. So far I have thought of high-capacity magzines, 80% lowers. Any and all suggestions are welcome. (Please keep investment under $500)