Selling at different prices

Is buying expensive perfume regarded as extravagance?

A trader is asking whether it is permissible for him to remove the tradename of a product or replace it with another name

Dealing with luggage left behind by passengers in the airport

What is the ruling if the price was unfair, so he cancelled the deal, but there is a penalty for the one who cancels it?

Ruling on offering an item for sale on eBay that is already on Amazon, selling it to the customers via drop shipping

Is Dropshipping Halal?

Selling a product at different prices to different customers

What is the ruling on charging fees in return for delaying payment until the time of delivery when buying online?

Ruling on buying apartments and shops before they are built, and on getting a discount if you pay in full up front