It depends on what kind of tickets do u want to buy - GA, Seats, VIP, Meet and Greet. U can follow the related link and compare ticket prices for Evanesence concerts from different sellers. Hope it helps u.
$90:70
about 450!
109
$17.00-75.00
$5
Tickets are €45 on O2 website
It depends on where and when the concert is being held.
100 dallors
$ 1
$5
£40-£90
£100 or depending on the concert