Finance is not worth it. Not for an iPad, not even for a car. Only for a house as that's actually an investment.
Save up, and the advantage will be that if it takes a few months or even a year you'll get newer models when they come out and you'll be glad you did.
If you have half the amount, that's a great start. You could keep saving and then on Black Friday or something go for a special offer, might be sooner than you think.
Avoid finance like the plague!