Hi,
Provide URL to let me see, without seeing your website's current state. I can't help you.
I guess the font-family on that screenshot is this: "Trebuchet MS", which is a default font family comes pre-installed on all computers
if you add a CSS rule like that:
.product-price { font-family: "Trebuchet MS", sans-serif;}
you will get the same font. If you want some fancy fonts, then you can check google font website:
www.google.com/fonts/
Regards.