Spanners and anyone else PC shopping ,
A great guide I use to track prices is here:
http://buycomp.hkgolden.com/ Just list the hardware type and optionally the brand/price range and there you go. The links will pop up the specs and location of the vendor too, most if not all of which are in the Golden Centre in Sham Shui Po. Prices for the 545/548 are listed at $3680/$4180 respectively. As usual, it pays to browse the shops, but prives are usually very close.
Cheers.