When I see and item in a store that is not marked with a price then I almost always just move along. I have to need something really bad to even consider it if the price is not marked.
I have a slightly different strategy. If I really want it, I’ll take it to the cash register and if it rings up for too much I just say I don’t want that item because it is too expensive. If they failed to put a price on an item, then putting it back in stock is the least thing they can do for me.