iTouchless EZ Faucet PRO Automatic Sensor Faucet Adapter for Any Sink Faucet sells on Amazon. I think the price is very good. Please read some of the reviews and see what people thought of the product. Do check how you might qualify for a free shipping offer if available.

  • Touch free, Hands-free operation – prevent the spread of germs and save water
  • Turn water off automatically when not in use – Save water and water bill
  • It can be used as automatic sensor controlled cat fountain – Your cat will thank you
  • Compact and Side Mount Design – Provides working space below the sink area Infrared Sensor – Saves water with quick and precise detection using Point-N-Lock technology