If you insist on buying hamster specific bedding then there is flaked paper (from Wilkinson's in the UK) or vegetable parchment bedding.
However, under no circumstances EVER buy you hamsters the cotton type fibre bedding! If it is vegetable fibres which are easily digested, that is ok, but the cotton type is an absolute no no. It can get caught in your hamster's digestive system and kill them, or get tangled around limbs and cause them to be lost. In some cases you might think "it never happened to me before" but why risk it when there is no need?
P.S Sorry this is a bit late, I've been travelling home today.