Amazon with IRONZON has the IRONZON Fingerprint Keyless Entry Handle (Black, Silver; F190) for $60 - $12 (clip coupon to apply) - $18 with coupon code LQR8FP6O [Exp 5/3] = $30 with free shipping on $35+ or with Prime.

Features fingerprint unlock, password unlock, and key unlock. Fits standard US doors.