I was buying a Viltrox camera lens via the Viltrox store and was searching for coupons on all the usual websites (ozb, couponese, etc.). Couldn't find anything that worked, so I just tried a few generics like save10, welcome, until I found Viltrox10 and saved about $30 AUD on my order!
Good for discount on the item cost, not shipping (obviously). Not sure about expiry.
Enter coupon at checkout