How can a 13 year old earn money?

I'm trying to save up for a trip to Nashville. My parents of course are paying for the trip but I want to buy some souvenirs. Also, Nashville has a really good mall, so I want to buy some stuff there. Anyway, my goal is to get about $100.00 by about a month. I'm not old enough to get a job, one more year until I'm allowed to. I can't mow lawns, babysit, have a garage sale, get a lemonade stand, make jewelry, or sell stuff online: my Mom said no to all of those. I know this is tricky but are there some ways that I can earn money? I do get an allowance of $10 per week for doing chores around the house, so I have that going, but I want to be able to earn a little more on my own. Any suggestions?