1.If you can quote us your lowest prices,we'd like to order 10000 dozen on each item.
2.I appreciate your conter-offer,but find it too low to accept.
3.That'll be the rock bottom,we can't sell you goods below cost,can we?
4.Taking the quality into account,you'll find that the price is very favourable.
5.I think it unwise for either of us to insist on his own price.
6.We're kept the price close to the costs of production.
7.sets the ball rolling
2.应该是counter-offer