The language combination Ελληνικά - Ισπανικά is not (yet) available for the book "Sleep Tight, Little Wolf".
You might be lucky, though, by changing the order of these two languages. Just go back to the Language Wizard and select Ισπανικά as first and Ελληνικά as second language:
If this doesn't help, shoot me an e-mail to enquire about the availability of the title, by clicking this link: order@childrens-books-bilingual.com
If the message doesn't open automatically in your email programme, send an email to 'order@childrens-books-bilingual.com' with the subject heading:
Availability of: Όνειρα γλυκά, μικρέ λύκε (Ελληνικά-Ισπανικά)