The best store for this person based on the statement is La patisserie.
The statement "Je veux acheter une tartelette aux pommes" is equivalent to "I want to buy an apple tartelette" which is a type of dessert.
The best store based on the statement is a bakery, which in French is equivalent to "a patisserie".
Other places such as le masgaisn de chaussures (a shoe store), la a boucherie (the butchery), or l'epicerie (the store) are not ideal stores to get this product.
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