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Where can I get 8 of them?

Take a set of PA Power fists, Cut off 3 bayonet blades for each PF. Glue the knife blades to the PFs.

Orrrr...You can get the Left PALC from the Commander set or you can get both from the Space Wolf Wolf pack. Shave off the wolfie symbology and you should be good to go.
http://www.spikeybits.com/servlet/the-3618/Space-Wolf-Pack-Lighting/Detail

If by any chance they are for CSM, you can get a squad of raptors, they come with 5 CCW, 5 Bolt Pistols, 10 LCs, and some special/power weapons.