Price the same items on both eurocraparts and their sister site and in many cases the "discounts" or "sales" on ecp bring things to around the same as the regular everyday price on craparts4less before whatever promocodes they have for example
£92 versus £77 pre discount codes, £78 versus £67 with promo codes
Alternatively can shop elsewhere and usually beat ecp on price and/or quality without needing any discount codes or having to get in touch with the ecp rep through the forum to get them to override the system. Places like SKS auto parts often offer a wider range* of brands too, list (and let you search by) both OE and equivilant part numbers instead of making up their own and are virtually always cheaper for ZF group parts like Lemforder, Sachs etc