banded collar shirts

Here it is, summer in Canada, and once again the search for the
elusive banded collar short sleeve lightweigh cotton shirt. Where
should I look? Where in Canada? Where on the web? Help.
There was a period when they were in style and I bought lots
because my husband just wont wear anything else. They are wearing out
and he needs more. I guess they are "out" now because nobody has them
and I have to endure either total dismissal or disdain when I ask for
them in the stores. I've been through it all before but it doesn't get
easier. Any ideas?