Oximeter Superstore via Amazon offers the Santamedical Finger Pulse & Oximeter
, model no. SM-110, for $19.95. Coupon code "SANPLOX3" drops it to $16.95
. Plus, Amazon Prime members bag free shipping
. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $5.14.) That's the lowest total price we could find by $12. It reads pulse and blood/oxygen saturation levels and features an LED display, carrying case, and neck/wrist cord.