Here is another karambit knife you can use to defend yourself. The Brous Blades Enforcer Karambit Knife has a satin finished D2 steel blade and black polymer handle. The blade is 2.5″ long and 1.25″ wide. The whole knife weighs 5.17oz. You also get a stainless steel pocket clip.
This karambit knife sets you back under $90 at this time.
[where to find it]