What is the ruling on participating in a tombola where products from a specific company are purchased, containing vouchers that are entered into a draw to win a prize, knowing that the cost of the voucher is not included in the selling price of the product?

It is permissible to participate in a free draw when purchasing an item if the purchase is for the purpose of the item itself and its price is appropriate. However, if the coupon has a price, or if the item is more expensive because of the coupon, or if the purchase is solely for the coupon, then this is considered forbidden gambling.