Can't you find a good local supplier ? Not many suppliers will ship paint due to carrier restrictions, ebay sellers must have an agreement or similar plus if your colour is off you have to start returning and it will get expensive.
I've used refinish systems and paints4u. Both fine. Express paints I've heard are ok too. Express and p4u sell lechler epoxy. Refinish systems sell HB body epoxy. Both very similar. All of them sell decent brand base, clear and colour.