Question about Epson EcoTank ET-4856

Here would be the text of the promotion, it's at the top of the "15% voucher" tab:

"Until and including 4.2.24, benefit from a 15% discount on selected Epson brand printers with the discount code "ECO15". Simply enter the discount code under "Payment" when placing your order. The discount will be automatically deducted from the current sale price. Cannot be combined with other discount codes."