Hi, I would like to offer $1000 for this item.
I'm sorry, my asking price is 1700 and I can negotiate a little but that offer is a bit too low.
How about 1200? 
We could probably meet somewhere in the middle at 1400-1500 but I think 1400 would be the lowest I can go, and you'd still be getting a great deal. I can maybe waive the rental fee if you can do 1500, so you'll be saving more money that way.
Okay, I'll take it at 1500.
Sounds good. I hope you enjoy the place!