Most low-end safes come with old-fashioned combination locks or a key lock. These are not particularly effective against an experienced burglar, but cost less than $100.

For those requiring greater security, the UL has approved electronic and digital locks that cost up to $350. Some are X-ray- and manipulation-proof, making the codes nearly impossible to crack. Other safes can be accessed only by swiping your credit card. You can even attach an electronic control device that regulates the times when a safe can be opened.

For additional protection, a drill-resistant hard plate can be placed over the lock and a steel bar along the interior to prevent the door from being removed.