Assign it to a collection agency on a contingency basis. 

Hello Doug, I am not a real estate attorney nor is this legal advice.Unless someone's state has specific laws banning contract assignments you should be fine doing the following.  

Each partner could then individually complete a 1031 EXCH by assigning their interest to a QI.

I have found that Redfin actually has pretty good search parameters to where you can look for listings that have been sitting a while that fit your buy box, and you can even do keyword searches for things like "as is", "investor", "seller financing", "guest house", etc. depending on what you are looking for.

Consult with an attorney to provide a purchase and sale agreement in your respective state with an assignment exhibit included. 

There was no "assign to property" option and basically I had to re-add their profiles to assign them to a property, which was clunky.

Here are a few contract suggestions:**Assignment of Contract**: This is crucial for wholesaling.

That was an excellent non-answer to my question, Skyler. hihi :)No they are not all the same. some are only interested in dealing with conventional purchases other are as you say better at handling assignments or double closes, some are commercial specialty, etc....A investor friendly one would be, at least from my point of view, one that understands there may need to be some last minute wheeling, dealing, and adjustment made to close a deal, understand what needs to be done and do not freak out about creative deals.Maybe my understanding or thoughts are wrong but that's what I meant by investor friendlyregards :) 

We have 2 San Antonio sub2 deals that are turn key homes and only require about $20-25k to close (assignment fee + closing costs).They're a great option!

I'd estimate that there are less than 1,000 legitimate, or "professional" wholesalers, in the United States of America, as defined by individuals who make $100K flipping contracts, and collecting assignment fees, in any form, and who have made that amount of income more than 3 years in a row.