Sixty-gallon rain barrels are available for about $100 from various regional non-profits working on water conservation and pollution (in the DC area, from the Interstate Commission on the Potomac River Basin: http:///cms/?option=com_content&view=article&id=50&Itemid=69 ). You can also get larger tank-style ones for under $500 (a better deal if you are planning to buy more than four of the 60-gallon types). They will fill with each rain (one inch of rain drops about 600 gallons on a typical roof) and might tip the balance regarding watering. I use water from ours for watering the indoor plants as well.
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