Having not purchased many parts for a while and recently needing to purchase quite a lot of parts I was surprised at how different the prices vary between suppliers. You really do have to shop around. During the last few weeks I have bought parts on-line, through Euro car-parts and also GSF, of all of the suppliers I found GSF to be be best overall supplier, although I would still use the other suppliers to ensure I purchase each item at the lowest price. I recently purchased an anti roll bar link from the Oldbury store and paid £9 for it and then needed another so phone up the store and was told that if I pop in the following day to collect the brake pads I had ordered online I could purchase a second anti roll bar link at the same price. I was disappointed when the following day the staff in store had no knowledge of my conversation and the had to pay more for the same part as had purchased just days before. My advice is to shop around, use the discount codes but also mention other suppliers in store as they may well match/beat the price. GSF are good like all suppliers a business so out to make money so inflate their prices and then give you discount codes to lower the price.