Here's what I just did. I paid almost nothing for a duplex i just bought and collected $2,100 at closing! WOO! So first - I contacted at least three different banks all within one or two business days. At each bank I obtained an UNSECURED LINE OF CREDIT. Two banks gave me $25K, and one bank only gave me $5K. The only reason I took the $5K was because it was my home bank. haha! Anyways, most of the time, banks will NOT allow money from an Unsecured Line of Credit to qualify as the Money Down needed for closing a deal. However, one of the banks that I obtained my LOC from WAS willing to accept that money as the down deposit as long as I went with them for the mortgage as well. So even though they felt it was a risky transaction from their point of view, since it was all done in-house, they were willing to finance 100% of the deal. So I think that is pretty awesome, right?
Coincidentally - the reason that you want to contact those banks all within the same day or two is so that all of these separate reports down show up on your credit report - it'll only make one hit on your credit report and by the time all of the banks say "YES" it will be too late for them to know that you went out and got a bunch of LOC's. THIS would also be a great time for you to go apply for some 0% financing credit cards (which I also did). These will all help you down the road for repairs once you buy properties if you don't have the money in the bank.
Cheers!