Thousandshores via Amazon offers Prime members the Dr.meter OLED Display Fingertip Pulse Oximeter for $22.99. Coupon code "BZ8754IF" knocks the price to $15.99. With free shipping, that's $2 less than our October mention and the lowest price we could find by $15. It reads pulse rate and blood oxygen levels in under six seconds and features a 4-way multifunctional OLED display, 10-second auto shutoff, alarm and mute function, and carry bag. It requires two AAA batteries, included. Deal ends December 20.