How do I empty my App Store balance to change region?

Buy something more expensive than your balance and use a different payment method from the current region for the extra amount; if you can't, click here and ask the iTunes Store staff to zero it.

(258232)

Hello ~If you are trying to zero your balance before changing regions…you may purchase an item from the App Store for more than your balance and the remainder will be billed to your credit card on file thus zeroing your balance . You may also go to lower left hand corner and click on Support and they can zero it for you or…

Apple Support

Contact Apple for support and service

Also if you are changing regions take a look through this article as well…

Change your Apple ID country or region - Apple Support

~Katana-San~