Update: Deal over.

Contec Finger Tip Pulse Oximeter – Link

Amazon has this on sale for today only, for just $13.99!

• ACCURATE AND RELIABLE: Designed to provide a quick, accurate way for spot-checking blood oxygen saturation levels and pulse rate while you’re on the go. Intended for sports or recreational use.
• Simple operation allows it to turn on and off with the touch of a button and get a reading in seconds, and you can expect up to 30 hours of continuous monitoring on a single set of batteries.
• Features:30+ hours of continuous monitoring on one set of batteries, Integrated SpO2 probe and processing display module, SpO2 and Pulse Rate bar graph, Bright LED display, Low battery level indication, Auto power off after 5 seconds.Package Contents1x Fingertip Pulse Oximeter (Color may vary) 1x Neck/wrist Cord1x Instruction Manual 2x FREE AAA batteries