I'll keep calling around, but I thought I'd post here to see if anyone has any suggestions. 

You forgot to put your location in your profile and your post so the answer is unknowable.

Get an approval letter from a hard money lender or a bank and post a non refundable deposit that in the event the deal doesn't go through the money is forfeited to the foreclosing lender.

Originally posted by @Henley H.

And lots of other goodies, which I won't bore you with cause it will sound like self promotion, which isn't my intention here. 

Either way it's great you are planning and thanks for even posting about a topic that no one likes to bring up.  

Maybe my post wasn't clear.

Like another post said if it's after the closing, you might be required to refinance your loan to do it. 

I love this post, Andrew!

The ROI on tax tools varies greatly from investor to investor and hinges on several variables, some of which can be objectively analyzed by a real estate tax expert and some of which require some subjective analysis (for which a real estate tax expert can provide valuable context).There are really 2 "no brainer" steps to take to get clarity for an informed decision:1 - Read Michael Plaks' posts about this topic.