Easy ways to make money for 12 year old?

me and my friends are 12-13 year olds and we want to go to a lady gaga concert. the tickets are around 270 and we have 4 months to make as much money as we can. but we dont really know how. please dont say dog walking or lawn mowing. for now we are going to do a bake sale. is there any other thing that we could do... show more me and my friends are 12-13 year olds and we want to go to a lady gaga concert. the tickets are around 270 and we have 4 months to make as much money as we can. but we dont really know how. please dont say dog walking or lawn mowing. for now we are going to do a bake sale. is there any other thing that we could do to make as much money as possible.

-thanks(:
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