I agree with Stinson, becuase there are so many "wholesalers" out there coming up with phony numbers and basically selling listed or MLS properties, it's a tough market for us to be in. You have to create value to your investor or they won't shop with you. I have a friend who's a contractor that gives me REAL repair estimates on the property in a detailed form on his companies letterhead to show the repair amount, this way the investor will see that I didn't come up with some random number and he can even call the contractor himself.
If it's not a good deal then I won't shop it an hope someone buys it. It cost me a little money to get accurate information on properties but it's worth it at the end when you move a house in a few hours.
If you want to work with other wholesalers, NEVER increase the price on the house, just split the spread. If a wholesaler wants you to add your own price, run away and find another one to work with. Be careful on what deal you are trying to sale because you don't want to end up marketing a home listed with an agent and find out when it's too late.
To end this ramble, I only go after deals that's not on the market and typically no one knows about but me. Word of mouth is powerful. Everyone knows someone who knows someone who mentioned selling their house at some point in time