Don't be afraid to go to 3rd parties, or ring your local motor factors.
I just had a complete set of KYB K-Flex springs fitted to my Coupe (literally today). They're decent standard-height springs, designed to be a like-for-like replacement for the original springs Peugeot fitted to the car. I got them off eBay; they're not all that pricey.
You could also see if EuroCarParts have springs; they didn't have them for my Coupe when I looked, but maybe they do now. I think it's Sachs stuff they carry, so it's not bad either, and they're standard height springs too.
2002 (D9) Peugeot 406 Coupe SE, 2.2 litre Petrol. Scarlet Red/Rouge Ecarlate/Rosso Scarlatto. Black Leather interior. SOLD
2008 (E60 LCI) BMW 525i M-Sport, 3.0 litre Petrol. Carbonschwarz Metallic. Black Dakota Leather and Myrtlewood interior.