I'm also fairly new here, but I can definitely help you out. Actually, I don't have a current discount code for Neptune, but have you checked out megakupony.cz? They have a bunch of discount coupons for different stores, including Neptune. Give it a try, and hopefully, you'll find something that works for you.
As of now, I don't have access to any specific discount codes for Neptune. However, have you considered checking out the best coupon apps? They can be really helpful in finding great deals on various products, including Neptune. Give them a try, and I'm confident you'll be able to snag a working discount code soon.