I have checked all old coupons and price is $8.99 for 10X 15X 20X 25X Spectacles Glasses Magnifier with LED (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Material: Optical Glasses+Plastic, Objective Lens Size: 15.8mm, Observing Distance: 20-50mm (Suggest 30mm), Ocular Lens Size: 20mm, Lens Quantity: 8 (2PCS 10X / 2PCS 15X / 2PCS 20X / 2PCS 25X), Color: Black, Lens Magnifications: 10X / 15X / 20X / 25X, Two Wearing Manner: Glasses and Head Strap, Head circumference: about 590mm
Latest coupon and price update (UTC):
Banggood ($8.99)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… Well, is it a good price anyway? Looks like a good price to me (average is $9.49).
Link: Banggood product page
Price: $8.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTOOS729
(you can check these old coupons out, but these probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 10X 15X 20X 25X Spectacles Glasses Magnifier with LED.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).