... is free (Open Source). It claims to be a rival for Dreamweaver and FrontPage but I don't know whether that is true.
Serif WebPlus6 (a very old version of their software) is free; once you have it Serif will offer you discounts on more recent versions.
The latest version: WebPlus9 is $79.99 so that would come inside your budget.
Also watch out for magazine cover disks, they often have older versions of software for free or trial versions of current software.