Here is the low down on retail grow store sales. All area dynamics are the same. Everyone in each operating area, gets the same cost but have a little wiggle room on the retail, with NO sending products back at a wholesale refund from the supplier. SO, the grow store can sell it at a discount and highly doubt they would actually throw nutrients away. They wouldn't be in business very long doing that and it destroys bottom line profits. Besides, they would have to pay to take it to a dump/landfill and pay the added money to dispose of it, being considered a toxic chemical. Too much money involved. On a set of AN sensi A&B they actually make about 10-12 dollars of profit on it. I, as a business owner, would rather get something for it by discounting it than get nothing for it by tossing it. Just my 2 pence.