you can sell items to the pawn shop for half of their official price. So if you buy something from the mc for 5 million you will get 2.5 from the pawn shop. And pay 2.5 to buy it back.
Are you talking about the user shops? If so, you'd have to find an item that was priced at less than half of the "official" price in order to make any sort of profit.
lol you will have to look for them yourself. why should I tell you when I can just buy up all the items and make the profit myself...?