Ditto what Matthew said. And to add to it a little...with a short sale, frequently the bank (in this case Wells Fargo) doesn't even know that it is being offered as a short sale until a complete short sale package shows up with a purchase contract already in place. In addition, Wells uses a servicer for their short sale accounts (America's Servicing Company).
Find a great agent in your area who is very familiar with bank owned properties (REOs) and short sales. They are totally different beasts and having a good agent who knows how to write those offers and get them accepted will work to your advantage.
Best of luck!
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For starters, you could check out the Fannie Mae "real estate owned" properties. You could also work with an agent who specializes in handling them.