1/4 x 28 square nuts

[a Wallace <wallaces@superaje.com>]

A while back I went looking for these nuts for my TR3a, to no avail. (They 
are the ones that rattle around inside cages, and are used to hold many 
parts of the body together.)
Does anyone know of a source of these, apart from the big 3? I need about a 
hundred and it just is too hard to buy them one at a time for ten times 
their worth, on principle. Also, I'd like galvanized or stainless if they 
can be had.
TIA,
Jim Wallace