Hi Steve
Did you try sailing boat shops , i was lucky there.
They use all sort of sizes , and small ones too for on those small 1 person sail boats.
Over here they even sell 1 mm ( i think thats something like 5/128 ) stainless steel.
And from there the sizes go up.
And it's very flexible as well because it has many small wires.
Give google a try for your area
here is an example
http://www.westmarine.com/webapp/wcs...classNum=10244
Eef