That's not how I did it. I went into the woo css and revised two files.
wp-content/plugins/woocommerce/assets/css
Make your revisions to the woocommerce.css and woocommerce.less files.
/* Price */
span.price, p.price {
color: @highlight;
font-size: 1.4em;
font-weight: bold;
Boom. It works.