My university has a proxy that lets you access journals they subscribe to by appending .ezproxy.its.uu.se to the host part of the URL (and then log in). I bet there are lots of similar services. I wrote a little bookmarklet to add such proxy endings to URLs with a single click. (Code at Github.)

URL to append (including initial dot): Create bookmarklet

(Bookmark above link, go to the page whose URL you want to modify, click bookmark!)