WordPress Plug-In Category Dropdown & Sub Category Dropdown

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I am looking for a WordPress Plug-In that has two drop down menu options and a search button. The first drop down lists all categories (states) in a dropdown box. After selecting the first category, the second drop down box is populated from those parent categories (cities). This would be concluded with a search button that would show all related "posts". I need this to be a WordPress Plug-In and the search be used in a widget.

Skills required:
Javascript, PHP, Software Architecture, Wordpress
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