It's still there. Just use
www.cameralensrentals.com and strip off the path part("shop/") and page part("category.aspx?catid=15") from the request. Then navigate to the page you want. They have either been doing maintenance on the site or you've accidentally gotten a bad link. This is why I try to never bookmark a deep-link into a site. Unless it's marked as a permanent link, which you find on some sites.