I personally use fleece squares as liners and they work really well, keep moisture away from her bum and the poo runs off really easily.

Although, if you want something you can throw away I have heard of people using cheap brand chux type kitchen wipes, you can buy them by the roll for quite cheap at places like 'Sams Warehouse' and those discount stores, they do look just like the blue nappy liners that I think Coles used to sell.