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I doubt that proposal will get approved.
We may have underestimated this.
Could I check what these numbers are based on?
We're behind schedule, so we need to make up for it.
Would it be alright if I double-checked, just in case?
Honestly, I don't feel the price is justified.
I can't go along with that offer.
If I may be so bold, let me make a suggestion.
In exchange for accepting this, I'd like more time.
That figure is hard given our budget.
This is just to be safe, so please don't take it the wrong way.
I'd like the final terms in writing.