I'm in Melbourne, so I cant give you any direct addresses, but... Peards is a Gardenworld, isn't it? There's one near me, and they have so many nice things!
They seem to get stock from all over; so If you were determined to get something specific, I would try and go to the source,.. you could try Corporate Roses (google em) based in S.A.; they seem to carry/be a supplier for a lot of Meilland roses, and I've seen their stock in garden centres etc in Victoria- you could try calling/emailing to see if they have sent anything to Sydney nurseries..
I've also seen a bit of Swane's stuff in my local Gardenworld- they have branches all over NSW, so you could try contacting them too.
Otherwise try contacting Peards and see who supplies them? They might be nice enough to tell you, seeing they don't deliver outside Victoria...