Hi.
Hello, straight to the point, I'll take all the phones; however, I can't pay more than 400 each.
I think that is great you want them all , but that price is far too low per phone. 
Level with me here, what is your rock bottom. I'm in need of 10 phones for a corporate swag bag, so I'd like to pick some up on the cheap.
How about 580 per phone?
I'm working with a supplier than is wiling to cut me a break at 450 a phone, can you do any better, at least match?
I could go as low as 500 per phone but that is the lowest without taking a personal loss.
I'll tell you what, since you haven't told me to take the flying leap, you have a deal; 500 a pone.