Parramatta: Couldn't get through on the phone, tried for a good 15 minutes and gave up.
Hurstville: Said they have sold out, no word if they are getting more.
Chatswood: Rang but got disconnected.
Bankstown: Said they may get it in stock anytime in the next two weeks.

And yeah, be polite, just because they don't know what you're talking about doesn't mean they are trying to screw you over. It's a low paying retail job give them a break.

Edit: Not to get anybodies hopes up, but my friend just secured a Soundwave for me from Chatswood. There may be more there but he can't be sure.