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I have an idea but the prices will also depend on what options are selected. Regular bushings and balljoints would be similar pricing but Group N bushings are more expensive.
But note that balljoints would provide no contribution to wheel rate while regular bushings would provide some contribution (say equivalent to 15 lb/in per bushing) while Group N would contribute by my calculations an equivalent to 56 lb/in per bushing on the toe arm.
That's the really nice thing about these arms - you can select bushings/balljoints/combination and thereby tweak your effective spring rate in increments.
On my car (e92 335xi) we just installed a set with a balljoint on one side of the arms and a Group N bushing on the other side. All 5 of my arms are bushing on one side and balljoint on the other side, like the M3 arms have.
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