I use that site to tell me what is the full retail price of spares, incl VAT, at a dealer. I find that if you just ask a dealer's parts staff for 'a good price' for anything substantial, they will knock 10% off at once.
Anyone online, except bmminiparts, seems to quote at least full retail (and sometimes more), so it can be cheapest to go to your local dealer if they give a discount!
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