"05" Av running boards

I'm new to the forum.? Just purchased a new Z71 with cladding.? Would like to know if I can purchase wide running boards for this truck. where to buy them, OEM if possible the part numbers and cost from Chev. if anyone knows. The dealer wants $600.00 installed, since it didn't come with them. I would consider used ones from a 05 Av. if possible. Any help would be greatly appreciated.

Try oemtakeoffs.com. i bought factory ones for $125. Got lucky and lived in same area, so no shipping.
    ,Vic

Thank You