thanks for all the replies! It seems like its different everywhere then. I guess I was just used to the main yard I use having them posted on a dry erase board and I know the yard 2 towns over has them listed also.
I guess I just figured it would be standard practice, kinda like going to a grocery store - the prices are marked so the customer knows what its going to cost them, I wouldn't buy something if I didn't know how much it cost first. Same goes for selling my scrap. So, I guess it isn't a shady business practice then which is what I was wondering since so many of you folks don't have them posted either.