I have a large, ongoing supply of 15, 30, and 55 gallon drums that have been used to transport soft drink concentrate. 15 gal are $15, 30 and 55 gal are $20. These are closed-drums w/ two 2" bungs with caps in the top. Tops can be cut and turned upside down if you're needing access to store feed or other dry good. Rain barrels (see photo) are also available at $50.