The first four copies of Eight (1A-1B -2A-2B) and the second four copies (3A-3B-4A-4B) are on sale with 40% and 33 % respectively at http://fidibo.com. Learners can provide each copy by paying 15000 Toman. Also, you can purchase e-books with a 40% discount with 6000 Toman lower the price when it’s your first time to purchase if you present the purchase code of hifidibo.