Buying from non-Muslim merchants when there are Muslim merchants

Question 3: What is the ruling on Muslims who abandon cooperation with one another by their dislike of buying from Muslim traders and preferring instead the stores owned by Kaafirs (disbelievers), is this Halaal (lawful) or Haraam (prohibited)?

Answer: The basic principle is that it is permissible for Muslims to buy whatever they need of the things that Allaah has permitted whether from a Muslim or a Kaafir. The Prophet (peace be upon him) bought from the Jews… read more here.