I am about to install a/c in my '87 e30. I got all (I think) major parts
from a wrecked car. But I need some gaskets, brackets, rubber mounts,
and some other small parts ($0.5 - $5).

I contacted local dealer and asked for parts (I mailed them all part
numbers). They replayed that they will have to order these parts, and
that I have to order minimum 10 of each. Since I need some 40 different
pars I'll have to spend a lot of money unnecessary.

Is this common for the parts for older models, that do not brake often,
or is this only the case where I am (at the end of nothing)?

I asked the guy at the dealer's this question by mail, and he replayed
"this is the way it is weather you like it or not".

This dealer is also the general importer for my country, and if I go to
another they will have to go to this one, and I will get the same
answer.