You cannot add "ASUS TUF Gaming VG259QM G-SYNC Compatible Gaming Monitor – 24.5 inch Full HD (1920x1080), Fast IPS, Overclockable 280Hz (Above 240Hz, 144Hz), 1ms (GTG), Extreme Low Motion Blur Sync, G-SYNC Compatible, DisplayHDR™ 400" to the cart because the product is out of stock.