Product Lists in FrameMarket & MarketPress

Am having a hard time finding the location to edit the product pages... Would like to set up a standard size and also a character limit so that they all line up a bit nicer.

Here is my test site - http://rummageym.com/

Basically I want to edit the php and CSS for this page so that the product boxes are always the exact same height. I can manage the CSS but need help finding the PHP and HTML.