“determine profit take the Amazon price and multiply it by .85 because Amazon takes out a 15% commission. Then if you’re using FBA, Amazon has a per unit fee and a per order fee and then a weight handling fee. We use $2.50 for our items because the per unit fee is $1, the order fee is $1, and the weight based fee is usually around $.50 depending on the weight of the item. Also, you have to figure in the cost of shipping it to you and the cost of shipping it to Amazon.”