Hi thomasa,
Glad to have you here!
What can be considered as the best method will really depend on your situation and on what can best deliver your goals based on what you currently have, on what you are capable of doing. For example, for those who are not willing to put up a lot of capital in starting the business, drop shipping is the best method since it is inexpensive to set up and that all the stock is virtual. Storage is not needed and there is no risk of keeping dead stock if the product becomes unpopular. These advantages outweigh the possible disadvantages, one of which is the possibility of having delays in delivery when the drop ship suppliers run out of stock.
Purchasing in wholesale is one among the other alternatives to drop shipping. Products are a lot cheaper than the retail price when purchased in bulk, and hence will enable you to create better margins for profit. Consequently, the main disadvantage to this method is the storage space required to keep the stock, and the expenses that come with it (rent, manpower, utility bills). When a product becomes unpopular, the items will have to be retained indefinitely, and yes the fact that they have already been paid for at your end.
Here are drop ship suppliers for iPad covers. They can send internationally -
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Let me know should you need me to search further.
Have a great day! :)