Went into Coventry's myself today and found that what you are after only comes in 30m rolls. Here is an example...
http://www.narva.com.au/products/browse/4mm
They were $25 apparently.
I'd go halves in 4 rolls of yellow, brown, red and black 4mm tracer rolls (15amp) if you want...
I'm also after 10m of 1 x red and 1x black wire 8 AWG (100 amp) Battery Wire and 10m of 4mm (15amp) 7 core or 3 core Trailer Wire. And other bits and pieces.
I'm doing some re-wiring myself. Perhaps we could share some tips?
0416210072