There is also Fish Outta Water in the Mick Symonds shop opposite the QVB(next to the Hilton). They have a range of lures and equipment as well. More so than the Compleat Angler store. Other than that , you will need to start heading out a little bit from town.
Local stores have loads of soft plastics from small sized things for bream ( Im not a fan of bream and reckon they should be used for livebait!) , to larger plastics like shads and sluggos. Plenty of rapala diving minnows, poppers like halcos, metals like raiders and snipers.
Like Brandon said though, specialist popper/jigging is a niche and not easily found. If you have 2 days in Sydney, then I would go to those 2 shops in the city.