cheap fabric

[vass]

Does anyone know where to find genuinely cheap fabric? Especially in Australia would be good, but I'm willing to pay postage if it's otherwise cheap and good. In particular, things I'm looking for: black or gothic patterned flannelette for my upcoming winter pyjama project, and something cool and either solid-coloured or subtly patterned, in a dark colour (preferably black, navy, or wine-coloured) for a dress.

I haven't done any sewing in a while, but I think it's time to pick it up again. Particularly since big people's clothes are expensive, and I'm not getting any smaller.