Microsoft FrontPage was discontinued in 2006/2007 and is therefore no longer available.
Since it was never a free product, you won't find it on third-party websites either.
There is free, cut-down version called FrontPage Express 2 which is available here (do not click the big green button, it's not for FrontPage Express): http://sourceforge.net/projects/frontpageexpres/files/Frontpage%20Express%202.0.2/