You can certainly BUY a Short Sale from the Sellers and the Bank.
But to have access to the Listing, you would have to be a Realtor:
There are a few exceptions to this, where some New England States will allow a transaction using an Attorney. I do not believe that Missouri is like that.
Because Short Sales and REO's are channeled through Reators, both for Listing and Buying, you should contact a good Buyer's Agent if you want to buy one. A Buyer's Agent is free to you, paid by the Bank.
Good luck and may God bless