Can MarketPress or CoursePress provide this?
"Whenever someone tries to print a pdf from my site, I’d like a voluntary donation box to appear, with a request for $1 per copy. I’d like the box to pop up separately for each piece they try to print, and to attach itself automatically to new pieces as they are added. The donation box should include an explanation of my costs..."
The requirements on these questions is really annoying. It either complains I have too little info or too much. And then it forces me to chose a site (the site in question doesn't exist yet) and a plugin (which I haven't installed because I don't know what to use), so I have to put in fake info. :disappointed: