Take a look at this ebay shop.

I have bought OSRAM BULBS off them for dirt cheap, and also I have had my replacement headlights.

They do all sorts on there and its all great stuff, and great prices, Side Markers, Headlight Units, and Front Lights take a look now!!!!

Subaru Impreza Side Markers Pair with Bulbs on eBay, also, Subaru, Car Parts, Cars, Parts Vehicles (end time 07-Jul-08 14:59:43 BST)

This is just one link but it will take you to their Ebay shop!!!

I would def reccomend