There are lots of alternatives to purchasing Acrobat. Many have reported satisfaction with
PrimoPDF, which bills itself as the world's number one PDF creator.
Bullzip, however, also gets favorable reviews, as does
CutePDF.
Many alternative PDF writers lack the bells and whistles of Adobe's Acrobat product-- such as add-on toolbars and menus--but some prefer doing without these. Many of them also will not allow you to manipulate your PDF creations in ways that Adobe's product will. For instance, deleting or re-ordering pages of a created PDF document is often not possible. However, if what you want to do is simply save a document as a PDF file, one of these alternatives will likely suffice.