Solution? Use wget. After installing wget, use the following command:
$ wget -E -H -k -K -p http://example.com/path/to/page
This creates a local mirror of the page + all external elements with file paths rewritten to reflect this. You’ll end up with a folder called “example.com” and possibly others if the page referenced other domains. Drill down through the file path structure to your file (so in this example, you’d find your page in the example.com/path/to/ directory).