You won't find many homes in that price range that could be fixed up in terms of cosmetics. Most will require a fair amount of work to be liveable. However, this link will take to you a list of homes that are available under $50,000 in St. Augustine right now: http://www.bor-mls.com/sag/maildoc/sd_Lp5bfX20140321163205.html
Please feel free to call or email me and let me know a little more about your needs and what you are looking for, and maybe we can find something that will work for you. I work with many first time buyers and buyers using special financing, so there may be something you haven't considered yet that can help get you in a home within your budget. Thanks and look forward to hearing from you!
Florida Homes Realty & Mortgage
184 State Road 312
St. Augustine, FL 32086