Cafago offers this TV Glasses Magnifier Headband for $13.67. Coupon code "PT2793" cuts it to $10.39. With free shipping, that's the lowest price we could find by $5. It features adjustable 4X or 3.8X magnification.
Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily. This item ships from China and may take up to four weeks to arrive.
These freebies are available to anyone with an internet connection, including both Amazon Prime members and nonmembers.