The $629.30 is true Dealer cost for the PAIR of running boards(part #12499191). Chevrolet Parts shows some outrageous List price of $1,227.14. I think most dealers I've talked to will sell them to you in the $800 to $850 range. When I e-mailed GMPartsDirect they quoted me $the $629.30 plus $125.86 handling and shipping for a total of $755.16 but they weren't in stock at that time but expecting them in mid-Jan. The pricing of one(single) running board isn't realistic nor the norm. Hope this helps. Pls. read the info. I posted on the "running board" thread about how easy it is to install them.