CellBuddy is a retailer that specializes in the sale of used and refurbished iPhones.
They are able to sell the devices at a lower price than other retailers, and still manage to make a profit.
This is possible because CellBuddy buys phones from individuals and businesses who are looking to upgrade, as well as from cell phone carriers who are looking to offload excess inventory.
By buying in bulk, CellBuddy is able to get a better price on the devices, which they then pass along to their customers.