Apple are one of the world's biggest and best loved technology companies. Based out of their head quarters in California there is always a huge demand for their products. They run a distribution model where, if you have the budget and the sales medium, it is best to buy directly from them. However you will likely need a bricks and mortar store or a prominent e-store to qualify for direct purchasing from Apple. There are also a number of suppliers that deal in refurbished, returned and reconditioned Apple products and these are easier to source from for wholesale buyers who are starting out.
Apple iMac 21.5-inch All-in-One Desktop PC with Mouse and Wireless Keyboard (Intel Core i5 2.9GHz Processor, 8GB DDR3, 1TB HDD, 5400rpm, NVIDIA GEForce GT 750M, Mac OS X Mountain Lion)