i have eibach springs on my car lowered 40mm with koni ajustable shocks they are top quality springs,
have a go at changing them yourself they are very easy to do you just need some spring
clamps and a few tools ,the only thing you need to have done after is your camber set up
as its ajustable on front shocks and needs to be done or your tyres will wear quickly ,
kwikfit did mine for £80 with tracking included.