How to convince my parents to get me another iPod and fast!!!!!!!! IM URGENT?

Hi guys, this is the second time I am asking this, I have an iPod touch, I love it and care for it, then it was full, so I needed another iPod, thanks to saafd okk ( if I spelt it wrong then sorry ) he said I can delete stuff I don't use, but an iPod nano with a really beautiful colour caught me, and I really want it before anyone else gets it, I have enough money and I told my parents that I really want it and I have enough money for it, they said I already have an iPod, but I really wanted it, so I done my chores and tidied the house ect. and I asked my parents again because they've seen I've helped them more than usual, they said maybe on Saturday, it was Saturday, and I asked my parents if I can go and they said maybe tomorrow, and they said the same thing for the last 3 days, so I asked again on the same day and they said no, so I want to convince them on how to get it fast!!!