I have a family member that works at Febi UK so i went through them to get the kit...£475 delivered
I wanted to try get involved in group buy on here but after asking him where he thought i should get them i found out the company is actually called Febi BILSTEIN haha...just one of them lucky things
I think some of the cheapest i've seen are on balancemotorsport, around £620 if i remember rightly...in my eyes still very much worth. Although, at that price you could start to consider a decent set of coilovers, all depends what you want from your kit i suppose dude.