I've been keeping an eye on ebay and the cheapest I've seen in the past 6 or 7 months was around £135 + £8 delivery. Current cheapest appears to be £149 from Poland including delivery so a £27 saving which is nice, also combine that with the savings on the rear dampers means I'm doing quite well so far.
Also a guy here ordered some Eibach springs cheap from ebay and the seller was in Germany or Poland and he got sent some other brand springs and the seller wasn't very interested and just kept saying it was "equivalent", ebay were also not really interested so he lost money sending them back and didn't get refunded the original postage costs to him. Hence to me, saving nearly £30 and getting something I can return for free if it's wrong seems a pretty good deal.