So you're looking at this sweet bike...
Hi I am interested in the bike and would like to offer $420.
I'm really hesitant to part with it for less than 450, though 420 is definitely a good number.
It is a nice bike, but I am not a fan of the Benny Bars, so I would have to spend some money to change them out.
I understand, though those Benny bars are pretty appealing to a lot of people. 
Let's meet in the middle. How about $435?
440 and you got a deal.
I like to get a little bargain. What about $438?
All right, $438 for a happy customer. Nice doing business!
Deal!!!