A great place to start would be ebay. I see them from £160-£360 but i would expect to have to pay more to have them color matched to your car. Installation is easy and is something you can do in your driveway or pay a shop.
2008 Vista Blue SES Coupe 5spd FRPP Zx3B Suspension
5000K D2S Retrofit
130,000+ miles and still on factory brakes and clutch!
Rep Points dont add themselves