how to get my parents to let me buy the rc ultra-micro t-28 trojan airplane?

so I've had about 6 rc helicopters and returned all of them, then I tryed out a rc airplane and loved it more than anything. I now want the ultra-micro t-28 trojan airplane because I got to good for the one I have now. I konw Ive had alot but I really want this more than anything I've ever wanted before. I saw videos and reserched, but I didnt ask them yet because I'm afraid they'll say no. I have the money though and I'm ready to buy it.

heres the address to the website I want to buy it from: http://www.amazon.com/Ultra-Micro-T-28-Trojan-RTF/dp/B003XQ2HTK

P.S. Im only 12 so please be nice.

Just talk to your parents about it and explain why you want it.