Im also looking to buy a running board in the near future, Ive tried to search online because its much cheaper than my local Honda dealer. Im planning to install it by myself to save more $$.
I tried to look for the cheapest "SHIPPED" running board online, I dont know how reliable some of this website but some are already known for good price and legit.
All this prices are shipped to me (pacific northwest)
Honda OEM 2016 Pilot Chrome running board ($625)
Honda village -$475
HandA accessories -$480
Bernardi Parts -$508
College hills -$531
BK honda parts -$483
Majestic Honda -$475
eBay Gregmayhonda -$447
Amazon sellers -$489 to $576
Those prices are from end Feb 2016 and maybe different due to shipping cost.
Please feel free to add where can we buy 3rd gen accessories online (cheaper deals!)