Changing font in MarketPress Grid View

Hey friends --

I can't figure out where to change the font on the grid view of products (using MarketPress and MarketPress Grid Plugin), and I'm going nuts!

I've looked in the CSS for the MarketPress grid plugin.
I've looked in the CSS for the MarketPress plugin.
I've looked in the Twenty Twelve WordPress theme.

CAN'T FIND IT!

Ideas?