Here in the UK I have just purchased
(christmas treat for the car) a set of genuine rubber mats (front & rear) part No 51.47.2.458.552 and 553 from my local dealer, who was advertising on ebay, which with shipping came to £99.95p. As you would expect they fit excellent and quality very good. So deals to be done, don't be put off by list price.
Was also looking for luggae compartment mat and found this one on ebay at 1/6th of official price, it arrived shipped from Poland by UPS in 3 days and again was excellent fit and very good quality.
https://www.ebay.co.uk/itm/TM-TAILOR....c100227.m3827
https://www.ebay.co.uk/itm/Genuine-B...72.m2749.l2648