Reject Shop sells them
Are you talking paper disposable cups or re-useable?
Besides BeanBay, Coles actually sell packs of 15 paper coffee cups (285ml) & lids (Chinet) - or at least they do here in Brisbane in the section with serviettes and plastic picnic ware etc
But you can also get really nice porcelain (and possibly other style) ones with Silicone lids which can be washed and re-used. Various places sell those including the Department stores like DJs & Myers, or maybe support your local coffee suppliers who may also stock them.