A retail company will sell to individual customers (shoppers). An example are the shops on the high street and supermarkets, etc. A wholesale company sells stock to the retail companies, who then sells their stock on to individual customers. Some companies will sell to anyone, and will often advertise that they are a 'wholesale and retail' company.
As Disney made the movie, a local Disney store may have some stock of the doll, a call to the store will easily tell you if they have any stock. The online Disney store is also an option as they would likely have more stock of the non-bestsellers. Other options include checking retail and auction websites like Amazon and eBay.