TODAY ONLY (5/12/2016). Amazon offers the MiLocks DKK-02SN Electronic Touchpad Entry Keyless Door Lock for a low $47.99 plus FREE shipping on orders above $49 or with Amazon Prime. Limited time offer.

You save 21% off the list price! That's the lowest price we could find (currently sells for $89.99 at Lowes). This could work great for those times that you lock your keys in or you just don't have your keys with you.

• Keyless door lock with electronic touchpad keypad entry
• Direct replacement for standard door knobs -- without any additional wiring required 
• Add up to 6 user passcodes
• Adjustable latch: 2-3/8-Inch (60mm) or 2-3/4-Inch (70mm)
• 25 year Mechanical Warranty - 1 year Electrical Warranty - Lifetime Finish Warranty