But its hard to extend this one to prices and bids. If you give a range of money, people will come back and say "but you said you could do it for [the lowest possible number you gave]"
The answer is to make it clear what the tradeoffs are. For example it could be more cash and less stock. Or lower price but longer lead time. Just offering a range without any other variables would be foolish, and complicated negotiations usually have more factors than just price.