These are nice looking frames, and that's coming from a licensed optician with 10+ years in the field. (This guy!)
As a professional in the field, I would STRONGLY RECOMMEND That you go to a local optician with your prescription and ask about lens prices and options before purchasing frames online. Most local opticians are happy to fill an RX in your own frame, though you will often not get as good a discount as they are running on a complete pair.
It is very important that you work with them to ensure your prescription will be a good match for a given frame, otherwise they may come out too thick or have compromised performance, especially in the case of bifocals or progressives. Just pull up the site and look them over together, any optician worth his salt should be happy to help you. If they give you a hard time just leave and go elsewhere. Heck, at this price they might even be interested in buying a bunch of them to resell in their shop!