You can use a VGA/DVI/HDMI splitter to transmit the same video signal between multiple displays, if all of the displays need the same image. Most of the splitters have a maximum number of displays that they can output to, since the signal power is limited by the video card. However, you can purchase devices to re-transmit the signal actively (instead of passively), at a higher cost.
If you need a per-LCD webpage, then the Raspberry Pi is the way to go - I don't think you can go much cheaper than a fully-functioning computer for $35 which can output 1080p video.
The advantage to using a single device, however, is that you're not as limited by processing power. You can have a single, powerful computer display the website contents if required, for example if the site has heavy Flash/Silverlight/HTML5 graphics rendering. However, this is far from necessary for simply displaying a webpage - the Raspberry Pi has more than enough processing power for text/images.