For those interested in conserving more water and dollars, dual-flush toilet retrofit kits are a great and inexpensive way to save water. They transform existing two-piece 1.6 gallon toilets into dual flush toilets. Depending on the activity the toilet receives, a kit can save well over 10,000 gallons of water per year. They are also inexpensive at under $25 relative to a new dual flush toilet. Not only do they save water, but they avoid the carbon footprint associated with the construction, distribution, and installation of the new toilet, as well as the removal and disposal of the existing toilet.
There are several varieties available. Here’s a list of the sites and prices I found online:
http://www.curryconduit.com/ 24.95 + s/h
http://www.ecoflushtoilet.com/ 39.97+ s/h
https://www.aquaprosolutions.com/shopping/shopexd.asp?id=325 64.99 + s/h
http://www.smartlivingdirtect.com/ 53.48 +s/h
http://www.globaltowne.com/product_info.php/products_id/352 79.95 + s/h