well i gotta make around 300 to 400 dollars to purchase something mowing lawns normally gets me 20 doing chores tends to get me 5 to 10 a piece what else could i do to get more money.
Nothing normal for a 13 year old.
You'd need an actual job to earn money like that in a short-ish amount of time. And I dont know what the employment laws are where you are but normally you can't legally hire a 13 year old for an actual full or part-time job.
Maybe try a paper round.
Or chores for neighbours. Mowing lawns, shovelling snow, cleaning gardens, etc..