Strong locks are important, whether they're holding back hungry barbarian hordes at a castle gate or the ghost trapped in your little sister's diary. Give ghosts brand-new shackles with today's Groupon: for $39, you get $79 worth of locks at Lockbusters. See here for the full list of zip codes Lockbusters services.

Run by a dedicated second-generation locksmith, Lockbusters secures abode access points as well as interior hideaways with sturdy, long-lasting latches. Privacy lovers can change a rim or mortise cylinder lock ($79) to prevent surprise visits from overbearing aunts or apply a key and knob lock ($79) to interior doors, thereby securing closet shrines to John McEnroe's favorite bandana. Lockbusters ensures transparency with an up-front price list that includes installation and labor costs.

Reviews

Sixty Yelpers give Lockbusters a five-star average:

• They analyzed my old lock and door, made recommendations and gave me an option. The work is solid and great service. – nelson w., 11/19/10
• Right off the bat I was impressed by how professional and considerate he was of my time. – Franchesca R., 12/9/10