It’s great that you’re considering traditional materials in your design. Unfortunately, we couldn’t source the pricing for you. However, I found some resources that might provide you with more context on the usage and availability of clay in building materials and general pottery:
EWB Australia acknowledges the traditional custodians of country throughout Australia and recognise their continuing connection to land, waters and community. We pay our respects to them, their cultures and their land; to Elders both past and present; and to emerging leaders. We recognise that the Aboriginal & Torres Strait Islander people never ceded sovereignty of what we call Australia.