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The Balisong knife is a total gimmick, it looks cool flinging it around and that's it.
In order to properly stab with a knife, you need a very tight grip on it. Often on the lesser quality ones, the grips don't contact eachother and you squeezing on them will cause them to break. Not something I'd ever want to actually defend myself with.
You can get them at a gun show like I did but I can almost promise you it will be bad quality.