From 02.12.2016 0:00 to 02.12.2016 23:59 you can find on item shop:
30% Discount:
Enchant Item+ - Price: 91 (129) DCs
On sale:
Power Chest - Price: 35 DCs
Myterious Chest Chest - Price: 35 DCs
Dragon Chest - Price: 89 DCs
Concentrated Reading for DC - Price: 49 DCs