In the past I have used an automotive paint supplier. They will make up the colour in a rattle can, they will have all the colour swatches to hand to get the closest colour. You will need to get a clear lacquer as modern car paints need a clear coat to get a shine. If you are spraying on plastic you will need a plastic primer as well, make sure all the paint and materials are compatable. From experience in the car refinishing business I am sure there are several shades of BR Blue, you may be able to get a can off the shelf in a car accessory shop which is close enough and will be cheaper. Walk around a large car park and see if there is a car in the colour you need and make a note of make, model and year, this will give you a guide to what colour it is.