+1 on EMT shears. Very very inexpensive, they'll cut through almost anything.
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This is exactly my experience too. Cut off steak knife or similar is the best knife I have used. It stays sharp for a long time, don't rust. Sherated really help to cut though things. Also being inexpansive, if you lose one, you won't think twice about it.
...I want a knife that wont rust easily, and is made very well. I see tons on Amazon and the like, but as a wrist watch enthusiast I know that searching on Amazon or ebay doesnt give you the best of the best for your price range, so I'm hoping you guys can point me towards the best option!