Aluminum Running Boards

[np2004]

I missed out on getting the OEM aluminum running boards when I ordered my 4.8i How much can I roughly expect to pay in total for the running boards listed for $565 and installation from the dealership in total has anyone got them installed aftermarket from the dealership? Also how well do the OEM running boards work and are they worth getting? I am debating on getting them because it is tough for my older mother to get in and out of my truck I never realized it would be until she got into my X5 lastnight for the first time. How well do the OEM aluminium running boards match with titanium silver because it seems like only black X5's have them.