Best place to buy new lambda sensor?

[Braveheart]

Need to replace rear lambda sensor on my 172 Cup, has anyone replaced one recently and can recommend where to get one for best price (save me some time hunting around on net ?). I notice that the rear sensor cable is slightly shorter than the front one but assume the actual sensor is the same so I could replace it with a new front sensor if if happened to be cheaper. Thanks.

 

[Louis]

Opieoils with monkylondon discount code

 

[Clio_fool]

Autodoc. I got two bosch ones the other month for £80.

 

[Braveheart]

Cheers lads, will look at both of these places ?