After it's been rendered by _what_? Obviously your LWP::Simple/WWW::Mechanize (both based on LWP) can't scrape it post-javascript cause they can't process the javascript ...

You would have to have some other browser in the middle ... for example you might be able to use Win32::IE::Mechanize to get the rendered html .. or if that doesn't work maybe there's a way w/Win32::OLE and drilling through the document's object model .. Don't know how, but hopefully it'll point you in the right direction (assuming you're on windows of course)...