Around Martin place:
ABC bullion (Pitt st) - mostly PAMPs
Gual (new company - never dealt with - same location as ABC) - mostly generic bars
Bullion club (Dymock building) - mix of bullion coins/bars/numis
Jaggards (Pitt st) - mostly numis (if you're lucky you can find some rare stuff here - a bit pricey tho)
MR Roberts (below Wynyard station) - coins / stamps
KJC (near Wynyard) - if you don't care about value
maybe more I haven't discovered
ABC bullion (Pitt st) - mostly PAMPs
Gual (new company - never dealt with - same location as ABC) - mostly generic bars
Bullion club (Dymock building) - mix of bullion coins/bars/numis
Jaggards (Pitt st) - mostly numis (if you're lucky you can find some rare stuff here - a bit pricey tho)
MR Roberts (below Wynyard station) - coins / stamps
KJC (near Wynyard) - if you don't care about value
maybe more I haven't discovered