Search for "wireless HDMI" on Amazon gives several options.

For example:
ASUS WiCast EW2000 allows you to wirelessly stream content from your PC to your display in Full HD quality. And with up 8 channel audio support, enjoy immersive surround sound experience on a wirelessly connected HDTV or monitor with speakers. It also supports devices including Blu-ray and DVD players, set-top box, PS3, and XBOX gaming consoles.