These Sennheiser RS110 II wireless headphones with a 100 metre range are £29 (click and collect) at Tesco Direct at the moment which seems cheap for a decent set of wireless headphones.
Product Information :-This wireless RF headphone system offers open stereo sound around the ear. Perfectly suited to all types of modern music and TV applications, the Sennhouser RS 110 headphones are lightweight and easy to wear, featuring a comfortable over-ear fitting. Transparent, well balanced sound with a great bass response comes with wireless freedom of movement and no restrictive cables. The wireless reception is not hindered by walls or ceilings and you can even listen to your favourite music in the garden up to 100m away. There are 3 manually selectable RF channels with the Sennheiser RS 110 wireless headphones, meaning you can always find the perfect reception. The control elements are all conveniently placed to provide easy, user-friendly operation.