Is it permissible to advertise the regular delivery price to customers without mentioning the special discount that was obtained?

Firstly: Electronic sales are permissible and take place upon the customer's receipt of the goods, or through methods of salam (pre-paid sale) or murabaha (cost-plus-profit sale), or through agency for a fee.

Secondly: Delivering the goods has three forms: 1. The delivery is included with the sale for a single price, such as selling an item and delivering it for one thousand (currency unit). It is not obligatory to inform the customer of the delivery cost. This combines a sale and a lease (service) for a single consideration. 2. The delivery is under a separate contract, such as setting one price for the item and another price for delivery. These are two contracts with two independent considerations, and it is not obligatory to inform of the delivery cost. 3. You act as an agent for delivery, for example, by saying: "The item is for such-and-such, and delivery is at the cost of the shipping company." In this case, you are obliged to inform of the actual delivery fee, and any discount obtained by the agent belongs to the principal.