about a buck a foot I think
when we took osha classes , we were told there was no such thing as an osha approved plank...but i see the osha stamp on some so i dont know what to think...rough cut 2 in. hemlock will hold anything you can safely put on a scaffold...
we bought 9' planks here in AZ. and paid $50.00 each. pressure treated and a bolt thru them, they are $65.00