I think Andrew at Southern BM sells them too or you can buy on line from the manufacturer direct. http://luxangeleyes.com/products
. Because they are under $1,000 there is no tax or import duty and shipping is quite cheap.
Quite often the guys who sell here have to pay the duties because of the purchase size and quantity they bring in, is it's always going to be dearer.
Everyone seems t be happy with the Lux LEDs but as true daylight running light none of the LEDs are that brght. Usually they are a high power (10Watt) LED on a heatsink that conducts light into a conductive light pipe, unlike Audi who have front facing LEDs
The best solution is OSS but obviously the most expensive. The light pipes are replaced with an array of white LEDs.