well if you sell a mass amount of something, you can mark the price down. for instance i wanted the traxxas TQi remote, receiver, and docking base but retail it sold for 205.00 but on ebay there was a guy selling them for 58 bucks. they were 58 bucks cause he had 101 of them to sell so he knocked off 75% retail value. I would personally check out hobbyking cause their prices are as stupid low as the hobbyparts prices but they have better brands like Turnigy and Gens Ace. I would recommend gettign either a Gens Ace or a Turnigy bettery because they are better value and they are a better company all around.