or just dont get the iPad considering you absolutely do not need it
Wow... Spoilt? Your parents won't supply the money, as you DON'T NEED IT.
No one needs an iPad. It's purely a comfort gadget. It doesn't fulfill any task that other devices can't cover already.
People buy it because they want to, and because they can afford it.
I don't *need* a Maserati, I want a Maserati. My BMW can drive me to work just fine. You don't have the money to buy it, end of the story, it's a great lesson to be learnt: controlling one's desires relative to one's wallet. If you don't learn that now, you'll be miserable all your life. There'll always be something cool and shiny you can't afford, no matter how well off you are.
Selling a Macbook to get an iPad is just stupid. In those situations where you *need* to do something an iPad can't handle, you'll be glad you have a full fledged computer. ditto for your iPhone. And no your old dell desktop can't replace a laptop unless you never leave your house.