Where to buy outdoor gear fabrics

Im thinking about making a bivy (and possibly other things down the track), but i cant seem to find anywhere that sells fabric in aus... im still undecided on the fabrics, but looking at things like silnylon, eVent, momentum, epic etc (or the non brand name versions of
).
anyone know of places in aus that sell these? online is fine as if its outside tas its gunna be hard to do it any other way
Cheers
Macca

anyone know of places in aus that sell these? online is fine as if its outside tas its gunna be hard to do it any other way

Cheers
Macca