I am looking for plastic endcaps for 1"x1" square tubing (.0625" wall if it matters). Just the simple, cheap, black plastic things that press into the tube and cap it off. When I lived in AZ, these were easy to come by, probably because they are used on fences all the time. Up here in Seattle, I can't find them anywhere and nobody even seems to know what I'm talking about.
Any ideas? Even a website where I could order some would be great, but I can't find that either.
Thanks, Ian