The American Mathematical Monthly recently e-mailed my co-authors and me a PDF copy of our article. The e-mail contained the line, "You may post it on www.arXiv.org and your personal website if you so choose." Very reasonable!
It is available at http://www.pseudoprime.com/amer.math.monthly.121.05.416-wagon.pdf.
So you can read it even if you don't otherwise have access to the Monthly, which Wikipedia tells me is the "most widely read mathematics journal in the world."