Wellue Pulse Oximeter Fingertip Blood Oxygen Saturation Monitor $15 at Amazon
Prime members only.
Amazon with Sensebody has the Wellue Bluetooth Pulse Oximeter Fingertip Blood Oxygen Saturation Monitor for $25 - $10 off with coupon code
3EJOQNI5 [Exp 12/23] =
$15 with free shipping on $25+ or with Prime.
Original Source of Info