The charcoal switches are cheap, you can actually buy them online for only a few dollars (Clipsal Iconic skins), so I would recommend just sourcing these yourself. Builder charged about $6 each, which is pretty much inline with what you can get them for online.
The towel rails were pretty much at retail from the Reece website (like $100 each etc)
great thank you, the matte black is a must for me. i'm still reading through your thread but your house is looking great!