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Where can I buy hair peroxide?

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I'm 15 and I want to dye my hair crazy red. I have naturally dark hair and it won't show up. Where could I buy hair peroxide? I tried sally's but they wouldn't let me buy any as I'm 15. My mum wont buy it for me, she said that if I wanted to dye my hair, I would have to get everything myself. Does boots sell peroxide? I've tried ASDA & Tesco but they don't sell any. any ideas?