You can make your own given enough time. Razor wire (Barbed Tape) is just a roll cut metal strip with trianglar tabs, use a strip of pliable plastic cut it and paint. Interlock two strands to form concertina wire.
Also you can mix that with "Barbed wire" consisting of tieing cut rubber bands on a spool of wire (the famous barbed wire in Steve McQueens scene of The Great Escape was made this way)
That way if you don't find a Manufacturer you have options.
