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One thing to remember is a tool box will most likely hold tools worth many times its' purchase price.
Some of the cheaper ones are so easy to break into you might as well leave them unlocked. One I saw used a post system with little notches that lock the lid, which could be easily defeated with a nail puller, never mind a pry bar.
Oddly Dee Zee makes just about all of the "brands" you find. Try Anderson's General Store or Even Lowe's or if you have a Tractor Supply near you they sell the best.
Remember these things take little more then the twist of a screwdriver to break open. A good one should run about $79.95 to $89.95 if you are careful