Hi there,
Ferplast no longer have a cage called the Duna Hamster - instead, they have the Duna Multy. It's a Guinea pig cage really (but far too small for an active Guinea) but has the small spacing between the bars at the top so it's suitable for a hammy.
Here's the link to buy one...
http://www.equinecaninefeline.com/ca...-delivery.html
I have one for my Little Mo - she loves it!