WDRP had nothing on the biggest sales platform in the World. If there was demand Amazon would help show a product that is in demand.
Look at the ranking and put 999 of each item in your cart. Check it in a few days and you can see what is left and that is the number sold. This is a very basic way to see what sold.
Time this and trade it but do not own it as the bottom could drop out so fast no one gets out.