Wellue Pulse Oximeter Fingertip Blood Oxygen Saturation Monitor $20 at Amazon
Amazon with Sensebody has the Wellue Bluetooth Pulse Oximeter Fingertip Blood Oxygen Saturation Monitor with Batteries & Lanyard for $25 - $5 off with coupon code
WREIKAGJ [Exp 11/11] =
$20 with free shipping on $25+ or with Prime.
Original Source of Info