Ferplast will replace it normally and great price - they are brilliant - I would have them all in Rainbows if I could find enough of them, especially with the addition of tube-line add-on holes. I would like them to be slightly wider so I can fit a Rody Savic on the side and still have both levels in though - just now I can only have one level in each cage due to amount of stuff I try to put in them
Or even just slightly higher so the wheel fits in accessible from the level - the smaller comfort wheels that come with them barely fit in the gap and are okay with a dwarf running on them but the weight of a Syrian makes them scrape the floor
Ferplast are designed with Winter White Russian Dwarf Hamsters in mind though I believe as this was/is the most popular hamster species in Italy or so I have been told.
For cheaper Raibows by mail order try
here. If you live in an HP, OX, LU or MK postcode area (approx 25 mile radius of Aylesbury) orders of £12 or more are delivered free of charge using our own vehicles. For the rest of mainland UK (except the Scottish Highlands & Islands) there is a flat rate charge of £3.99 for orders up to 20kg in weight.