You have until 31 July 2017 to enjoy it, and it is that when you purchase a toner that is within the selection made by Amazon, you get a 20% discount if you buy a second imager.
To get the discount it must not do anything, or get any promotional code or anything of that. It is as simple as adding two toners that you want to buy, and that they are within the selection made by Amazon, and automatically, at the end of the purchase process, you will be shown the amount corresponding to 20% of discount.
It is worth if? Therefore, you here with the comparative tables of Savemoney.es toners that you can buy taking advantage of 20% discount for this promotion: