I have someone interested in a 155lbs peter wright I have and the shipping prices for anything over 150lbs are crazy who do you guys use?

Blacksmith Mail; slow but cheap is how I got my last 165# anvil.  Have you looked into freight aggregators?  Strap it to a palled and ship it common carrier?  Receiver usually has to go pick it up at the depot.

I've had a couple of power hammers shipped via "back haul" by a local trucking company that ships Vermont granite all over North America.  I call them up and put in a request that they call me back when they know they will have a truck in X city coming home empty.  If willing to wait a week or a month you can often ship items for CHEAP,  like just above the cost of the truck's fuel.  

I've never done it, buty I've heard about guys using Fastenall (a chain of industrial supply stores) to ship anvils from one store to another for cheap.