Promotion code 'MikeBMP30'
Simply, choose the lens that you desire (the photo extension kit is the best value) and enter the promotion code at the checkout. I will also send the code through to your supplied email address - for your future reference.
Disclaimer: You may notice the arrangement I have at Struman Optics - is that they promote my Free Smartphone Photography course. No commissions are paid and I value your honest feedback on their products.