These are a must-have in the eyelash-extension industry!
You can sell these with your business card for $5 or simply do what I do and offer for free with their appointment. I often use this wand on my clients DURING lashing and give to them at the end. It adds a touch of class, sparkle and the "i received a present from my eyelash technician!" feel. You can certainly add other products such as shampoo, your lash care instructions, a wash brush and bump up the price to $10-$30 depending on wat you choose in your lash-package.
These are also avialable in packs of 20, 50 and 100 in my other listings under Eyelash Extensions for bigger discounts.