If you are looking to purchase these along with your lens, here are common varieties available online: VWR Lens Paper
Some professionals advise against cheap lens tissues, as they can sometimes trap grit and scratch delicate coatings. Many prefer high-quality microfiber cloths instead. buy camera lenses online
If by "paper" you meant the documentation that comes with an online lens purchase, always verify the warranty card and authenticity certificate , especially when buying used equipment to avoid scams like receiving a "box of staples" instead of a lens. How To Clean Your Lens Properly - Food Photography Blog If you are looking to purchase these along