One other thing you can try, if your printer doesn't support larger paper sizes, is to use the zoom command or snapshot tool to increase the size of the text before you print. It only works on a portion of your page but it makes reading much easier. To do this use the zoom tool to increase the magnification on a given area of the document. Next, bring up the Print dialog and select "Current view" under the Print Range section. The thumbnail on the right will then display what portion of the page will print on your paper.
Here is a link to a quick tip tutorial that also explains how to do this:
http://tv.adobe.com/watch/learn-acrob...