Greenwolf that's cheap and kind of kills the "roleplaying". I do admit though good idea but for me that's a bit close to "ghost walking" (ie. walking around like you've already been hit (no killrag) but when you get within engagement distance engaging).
Rubber/training knives from anywhere are fine. Also those plastic swords you can get from Toys R us or whatever are also good too. Just don't shank other people with real knives.
Real knives are banned on field in some places and at some others you're only allowed a small swiss or multi tool that you have to physically open to get to the blade (so you know that you didn't accidentally change the rubber knife for a real one and when you go for a knife kill actually shank someone).
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE