Only place I can think of is junk yard, I don't think parts stores sell them individually, only with plug wire kits, you might try JC whitney, they might have those "make your own" kits, but you'll still end up with more than you need unless you can find just the ends and boots.
2013 WRANGLER SPORT 2 DR., V-6 ,AUTO,HARD TOP
)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights