Lowe's offers the Kwikset 264 SmartCode Motorized Deadbolt in Satin Nickel, model no. 264 CNT 15 SCAL SCS, for $39. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to dodge the $5.99 shipping charge. That's the lowest price we could find by $43 from vendors with sufficient stock, outside of the deal below. It features a backlit keypad, adjustable latch, standard deadbolt strike, and 1" deadbolt throw. It requires one AA battery (not included). Deal ends December 7.
A close price: Home Depot has it for $39.88 with free shipping.