One nice trick to control raw land is looking for 5 or more acres with a house on it so that the loan is easier to get. Raw land you often have to come up with 50% of the deposit whereas if it is 5 acres with a home, you are applying for a residential loan and can get 100% Loan To Value! This is a great site to find those deals:

www.4horseproperty.com
www.equineproperties.com

Don’t forget the government auction sites such as
treas.gov
usdoj.gov

For larger deals (commercial) I have also used
loopnet.com