The DEMO version only includes 4 pages:
http://thriftyfun.net
http://thriftyfun.net/index_php/2-uncategorised/10-falling-out-of-the-sky-and-living.html
http://thriftyfun.net/index_php/component/mailto/tmpl-component-template-protostar-link-bb65bda6f34dad7dd2ff09796f349febf06cf7fe.html
http://thriftyfun.net/index_php/2-uncategorised.html

It is possible to download these free files and install them on your server, so you can test how the site works.
Visit https://www.waybackmachinedownloader.com/en/buy-wayback-machine-downloader-recover/ to buy a fully functioning site.
Go back to the index page