There is nothing wrong with buying from companies that sell by instalments if the product is in their possession

Ruling on buying an apartment from the bank by instalments

Ruling on increasing the price of an item for some customers and not others

Ruling on opening one’s business on the day of kaafir festivals

Selling animals by weight

It is haram to sell an item without pointing out its faults, even if he is selling it to a kaafir

Ruling on one who sells a product to a person who is buying it with an interest-based loan

When is buying a large house considered extravagance?

Selling government airline tickets if one travels by land

The seller must disclose faults in the item to the buyer