I recently participated in the Witchery online survey- I received a credit of $10 to my club card (Witchery often do promos like this, and have a great spend-and-save offer too!).
I decided to spend my voucher, and the staff were really helpful in helping me to choose an item. Despite using a voucher, staff still treated me well, wrapped my purchase and chatted with me. Overall a great experience, I shop here often and will shop there again!

Approximate cost: $10