I got it online, from Auxbeam. But plenty available on ebay/amazon. Hard to determine which is the better one. Mine was about USD55, including shipping.
As above, its from Auxbeam. About USD55 in total. I saw more expensive ones that are branded, like OPT7 and JDM Astar. But I feel LED aftermarket is limited. The light output is great right over the car, but the intensity and light drops off in the distance. I think HIDs are still the best option but I wasn't comfortable with ballasts and relays running in our cars, especially with the auto light which would trigger the lights on and off. For the money I spent, I am quite satisfied. For now, haha

Didn't know Osram and Philips had LED aftermarket for our lowlights. Or are you talking about fog lamps?
I believe they are; they are still halogen-based bulbs.

May I know what is the bulb size for the reverse light?
I'm thinking to replace it to LED~