No, not unrealistic at all. Just careful. BUT....
I find a lot of strange materials at estate sales and church sales,
but not as much in the usual yard sales. Some materials don't seem
to be made much nowadays, and in some cases that is good. But a
long amount of years ago I saw some $25 dollar a yard material at
the Stanford Shopping Center in CA, that I yearned for and talked
about till my husband told me to get it for my birthday. Of course,
by then it was gone and so was that material shop. I've never seen
it any other place since then. I haven't remembered a lot of the stuff
that I've bought over the years, but I remember in sharp relief what
I yearned for and did not get. Just a yard of that material I could have
used, but did not because in the 1980s that was way too much for
"just fabric".