http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=160524076423&ssPageName=ADME:X:BOCOR:AU:1123
http://cgi.ebay.com.au/Black-Throwing-Ninja-3PCS-Full-Tang-Adjustable-Knife-/160522837466?pt=AU_KnivesSwords&hash=item255fe81dda#shId
http://cgi.ebay.com.au/Black-Throwing-Ninja-Knife-3PCS-Full-Tang-440-w-Sheath-/160524194686?pt=AU_KnivesSwords&hash=item255ffcd37e
seems a bit cheap for a descent throwing knife.
I have both classic and hibbens at home and they both set me back a few quid. there's a lot of throwing knives on offer and usually they're made from cheap stamped steel. The fact that the ones you show are coated black make me suspect they are exactly that grade. A halfway descent throwing knife will set you back at least 50 AUD and go up from there. The key to a throwing knife is excellent balance and descent weight. those cheap things usually don't have any balance at all. how much you want to spend is up to you but I'd advise going to a shop and checking out some quality hardware.
As for the above poster. A throwing knife shouldn't be sharpened you offset the balance if you do. Secondly it's meant to be a sports tool never a weapon. If you check the shape of a classic throwing knife you'll soon notice that it's a pretty akward thing to use for any other purpose.
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