I was told to check out Jellyfish.com because they had an interesting way of selling stuff. Where there are offers of the day and the price starts at the highest price then gradually drops in price till it hits $0 and people can buy it at that moment until there are no more products left.
The trick is that no one knows how many they have to sell and you can talk smack in the chat box below while you wait for the price to drop to what you feel is the right price. But if you wait till too long there won’t be any left to purchase and your out of luck.