Clearly you are looking at the Moulded Matting System and not just a pair of Defender rubber footwell mats? If that is the product you want then that is what you will have to pay however I believe it is the same system marketed (manufactured?) by Exmoor Trim.
Not knowing the exact vehicle (engine / gearbox set-up), as an alternative have you looked at the less expensive 1-piece rubber mat (ELT100430 or similar)?
There was another well known brand (so well known I can't bring it to mind at the moment!), will re-post when I have found it.