I decided over the winter that it would be nice to have some rain barrels to collect rain so I wouldn't have to use tap water. Instead of spending 60+ dollars each plus shipping, I build my own tandem barrel system for around $100. I used barrels from where I work (they contained powdered aluminum previously), coated them with rubberized coating (do-it-yourself bedliner for pickuptrucks), and jury-rigged various plumbing fittings.