I have done this at least 3 times for up to $1000. I have had a lender try to explain to me that a buyer cannot get cash back and I explained to her that I was meeting the ratios and providing the required funds for the transaction per the contract and this was outside the scope of that. Instead of them making repairs, I was at their expense. They ended up agreeing and financing (these were minor repairs and not major items affecting habitability). But that wil not work in your case as foreclosures are as-is, where-is homes - you kinda threw me because a bank owned property is not a short sale so I'm not sure which you mean. Good luck!