You will be able to renew your domain name more cheaply by using renewal discount codes. Not all .EUS domain registrars work with discount codes, so in order to use the codes, your domain name will need to have been registered with one of the following registrars: Arsys, CDmon, Dinahosting, Entorno Digital or Hostinet.
To be able to use the discount code, sign into the management console of your registrar and request a domain name renewal. When you go to the shopping basket you will see the option for inserting the code. If the code is valid, the discount will be applied to the price appearing in the shopping basket.