Cheaper than a Margarita, Just as Refreshing

CET Solar usually has some of the most reasonably-priced DIY energy-efficient products on the web. And shipping's FREE (i.e., already included int the price, but hey.). Go all out and spend $13.50 on the 1.5 gal/min. aerator above and you can cut your kitchen and bathroom sink's water use by 20+% in under thirty minutes.

We can also personally recommend their 2.0 gal/min. Spoiler-P shower head ($13.55). It's possibly only a 20% water use reduction from the common 2.5 gal/min, but prices for the best-looking-and-acting 1.6 gal/min (or less!) products are many multiples of $13. We'll keep looking.