WTB Subwoofer in Sydney - SVS ultra PB, SB or similar

Item: WTB Sub or two for a stereo system
Price Range: negotiable 
Item Condition: New or Used
Extra Info:

I am looking for a subwoofer or two for that extra bottom end.. my speakers are no slouch on bass region (b&w 803), so ideally would like something on the level of SVS ultra or similar.. 

Hit me up with what you have

Thanks

J