A opção --convert-links deve fazer o que você está procurando:
wget --convert-links --no-parent maine.craigslist.org/fuo
Mais informações sobre essa opção e o que ela faz está abaixo (copiada de man wget ):
--convert-links
After the download is complete, convert the links in the document
to make them suitable for local viewing. This affects not only the
visible hyperlinks, but any part of the document that links to
external content, such as embedded images, links to style sheets,
hyperlinks to non-HTML content, etc.
Each link will be changed in one of the two ways:
· The links to files that have been downloaded by Wget will be
changed to refer to the file they point to as a relative link.
Example: if the downloaded file /foo/doc.html links to
/bar/img.gif, also downloaded, then the link in doc.html will
be modified to point to ../bar/img.gif. This kind of
transformation works reliably for arbitrary combinations of
directories.
· The links to files that have not been downloaded by Wget will
be changed to include host name and absolute path of the
location they point to.
Example: if the downloaded file /foo/doc.html links to
/bar/img.gif (or to ../bar/img.gif), then the link in doc.html
will be modified to point to http://hostname/bar/img.gif.
Because of this, local browsing works reliably: if a linked file
was downloaded, the link will refer to its local name; if it was
not downloaded, the link will refer to its full Internet address
rather than presenting a broken link. The fact that the former
links are converted to relative links ensures that you can move the
downloaded hierarchy to another directory.