How to save up for a Macbook Pro/Air?

Not quite sure if I want the Pro or Air, but I know I want one of them. I might be going on 3 week trip to Washington this summer, and I'm thinking about moving away for schools (AKA, boarding school. Not freshman year, sophmore). I'm only thirteen if you couldn't tell. So far, I have $40. Yeah, I'm So close to being completely saved up. Anyway, what can I do to save up money? I make bracelets and I would sell them at school, but I can get in a LOT of trouble if I sell them at school. What can I do?
{I get $10 for chores, and $10 for helping my mom since she's out of the hospital. That's $20 a week. So I get $80 a month. It will take 50 weeks until I have enough money if I save up at this rate, but I'm also saving up for a Nikon D3100!}

Added (1). I just got a new desktop for Christmas, and I might sell it on eBay. (But at the same time, I might keep it… Not sure yet.) I have ample books I need to sell on eBay (or to friends). Any other suggestions? I already do chores, make bracelets (might sell them on Etsy), sell on eBay, help my dad occasionally with his job, and I'm only 13. Can't get a legal job.

Do as everyone else, do what you can, save what you can
it takes time as simple as that

a mac aint cheap ofc, but there are cheaper was (there are computers and laptops that are NOT mac computers and works perfectly exactly like a mac for half the price)