How to persuade my mom to let me buy off of eBay?

I really really really really rreaaallllywant the iPhone 5, 4s or 4 (most likely the 5) and the sprint iPhone 5 is like 29.00 mint condition or something like that but it was located in the Bronx. I'm in Brooklyn. How do I persuade my mom to let me go one ebay and buy stuff?
2 answers 2