I suggested it to Pricerunner a couple of years ago, but they didn't seem interested. Probably too much work...
It should be able to lower the price on certain standard goods, but much cannot be compared. Take, for example, timber at Byggmax, which can result in more waste and requires greater efforts in the form of knot varnishing and filling (speaking from experience). Different brands and planning mills are hard to compare if you're picky when it comes to your own house (and you are).
