I added the code I'd given previously and I didn't check every page on your site, but on the ones I did, the font hadn't been changed.
You said in your email:
This is most likely a conflict with your theme. Instead of using the Exchange page type in Exchange > Settings > Pages, you'll want to create your own pages and then use the WordPress page type. I've already done this with the cart page for you, so you can take a look (http://www.karengorrin.com/shopping-cart/).