Cat litter can be a little uncomfortable and hard on a hamsters feet
But Megazorb would be fine, its cheap, lower in dust (lower than carefresh) and keeps the cage smelly nice
or you could just buy mixed paper bedding like this
http://www.petsathome.com/find/category ... t-is-13647
This shredded paper would go well with Megazorb and hamsters would use it to sleep in
http://www.petsathome.com/find/category ... t-is-13663
They sell special wood litter but I think that it's just as bad as sawdust, so im a bit unsure on that