Gusgus is on the right track. A quick access safe is both fast and secure. Can't beat that, although the good ones will cost you much more than the $8 trigger lock.
I'd take a good look at the R&D Enterprises Handgun Box (http://www.handgunsafe.com). It's a heavy steel safe with Simplex push-button lock, so there are no batteries to die. It also fared very well in a Gun Tests article which pitted most of the popular fast-access boxes against each other. Best of all, made in the USA.
Justin
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Justin T. Huang, Esq.
late of Kennett Square, Pennsylvania