the Chinese sellers are playing like eBay was a bazaar. you will generally find they introduce an item with slightly different packaging and prices that range some 10 percent or so around a core price. they are obviously trying to see how much they can nick ya for. they revise their pricing until there are no more suckers taking the highest prices, and then it becomes lots of 1 "46 availiable" changing to lots of 1 "3 availiable."
the prices creep up as the pack around the item decreases, and then they introduce the concept of artificial-rarity into their marketing.