Help saving/earning money?

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Besides this site (this is my first month using it, so I won't get paid until April.) I get $10 a week from my parents for helping around the house. So, assuming I make (at least) Payout, that means each month I'll have $50. There's this electronic drum kit I want extremely bad. Problem? I totaled what it would be with the kit, a bass pedal, a seat/throne, an amp, and all that. It's near $2000 dollars. Now, My Birthday is in September, but my mom said that her and my dad will probably give me about $100, and maybe another 100 from everybody else. So, doing the math in my head: $20 this month (I'm buying a videogame the 13th) $50 in April $50 in May $50 in June $50 in July $50 in August $250 in September So, bare minimum of $520. Well, that's a little over a quarter of what I need. I've been thinking about possible ways to earn it, and a decent one was sell all my unused stuff on E-Bay. I'll probably do that, but I don't have a lot of stuff. So, how can I earn $1,500 by September? Thanks