does anyone know of a wireless tv as monitor device?

I'm using a laptop with internal 802.11 b/g and I'm looking for a device like the wijet for my TV, the wijet is for projectors and is very expensive. if anyone knows of something that can do the same as the wijet but for a tv and less expensive please post. just for clarit I dont want to be able to just veiw videos and what-not over my tv, I want to extend my desktop, or more specificaly clone it. and I dont want to have a little box hanging fomr my laptop, so I want one that uses a network, please post if you know.