Hello.  I am interested in the bed.
Hi, I really need to sell this bed quickly so I can make room in my garage.  I can deliver it to you and throw in a mattress if you are willing to pay $150.  Do we have a deal?
Thats a little high.  If I come pick it up, are you willing to offer it for $75>
No way! That is half the price I am asking.  I can do $125 and deliver it.  That is the lowest I can go.  
If I pick it up will $115 work?
Do you have something that you can give me (like some other furniture, such as end tables) that I can sell to make up the difference?
Yes I do have some end tables.
Okay that sounds great!  I will take the pair of end tables and sell you the bed for $115.  Thanks!