And Amazon will ship concertina wire to your door. Not as subtle as barbed wire but definitely effective.
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I'd be hesitant to have any sharp blades on it, be worried it'd cut through my gloves when doing projects where I'll need a taught line. Last thing I'd want is any kind of cuts that could get infected in such situations.
I just did a fast search on Amazon's barb wire prices & it's way above for the amount I can buy at Tractor Supply. For a roll of 1,320' on 18ga barb wire @ Tractor Supply goes for $37. Can even buy it coated in green paint for a 40 year rating outdoors.