Ok ill tell u what i would do:

Ask ur Mother/Father: 1$ everyday and say u will get something to drink, save that money.

Help ur Mother/Father in anything they need , but with the condicion of getting something in exchange ($) .

Sometimes Ask ur Mother/Father if they can Give u 5$ and say ur trying to buy a game . XD

Or Try washing cars and stuff for $.

Last and Ultimate Resource: Beg to all ur family some money to buy the computer xD.

And Buy a Computer of 600-800$ its enough believe me.

u should get 600$ in like 2 months or so.