I was quoted £141.56 inc. VAT by Cotswold BMW for 2 front Sport springs so £70.78 ea.
The rear springs apparently only come as a pair. And these were quoted at £184.86 inc. VAT for the pair.
Prices also include 15% discount on front springs and 7.5% on rear springs.
So I would give Ross Hands at Cotswold BMW (rosshands@cotswoldgroup.com) a shout before giving up. Tell him Robert 'the Z3 loom man' sends his regards
That's still a total of £326. Which is exactly twice the price you can pick up a set of Eibachs for. The trouble is the likes of you and me
@DrWong are in the minority of wanting to keep things standard. Most people would be happy to lower their car and pay half the price!