How much is a iphone 4 in ukraine?

How much does a iphone 4 16gb Unlocked New Cost? And how much for a used one?

Prices vary a lot. Depends on where are you going to buy it.
~ 480-670 and > USD.
E.g.here you can see the prices in both - grivnas and dollars:
http://www.notus.com.ua/iPhone-4 - scroll down, you'll see iPhones 4 16 GB

other sources; prices in grivnas, so use converter:
http://apple.technoportal.ua/mobile/apple-iphone-4s-16gb.html
http://price.ua/apple/apple_iphone_4s_16gb/catc52t1m307487.html