if you check out the following companies models you may find a lot are 1/100 or very near,
majorette, a lot of thier smaller vehicles are 1/100 esp the trucks and busses.
tomica, allthough all over the place scale wise to fit the boxes a lot are around 1/95-1/115
they even do a truck carrying a bulldozer in 1/110.
the trick is to make a note of the ones the right scale and then try to get the worn/damaged ones on ebay quite cheaply,
siku, make a few.
there are also plenty of helo's in 1/100 in diecasts as well.
there are also some of those cheapy diecasts that are to near enough 1/100.
good luck