Negotiating Short Sale with Option Contracts

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I'm about to start flipping short sales with option contracts. Does anyone have any general tips and advice? I've been told that many banks are opposed to it because they prefer to sell the house at the price the investor is flipping it to the end buyer. I've noticed that negotiating shorts without options contract has been difficult with banks that have received bailout money. Should I expect to run into this problem with options contracts? I would appreciate it if anyone can refer me to any articles or websites that discuss the matter.