Oh, well most a-arm "kits" are full kits.
The only one I can think of right off hand that's NOT a full kit is the Lone Star Racing a-arms. You buy 4 arms and two tie rods and then have to purchase the ball joints separate.
The kit I make is a complete a-arm kit except for the pivot tubes, pivot tube bushings, and grease fittings (all easily removed from the stock suspension you're removing anyway)
It includes 4 ball joints, 4 a-arms, and 2 tie rods.