Tanga offers the MiLocks Keyless Entry Deadbolt Door Lock with Electronic Digital Keypad in several colors (Satin Nickel pictured) for $53.99. Coupon code "LOCK" drops it to $51.99. With free shipping, that's the lowest price we could find by $11, although we saw it for $3 less in March. It includes an adjustable 2-3/8" or 2-3/4" latch, and holds up to six passcodes.