Silicone Full Face Gas Mask Goggles (Banggood, Aliexpress: Color: Blue and White, Material: Rubber / PC Lens (the best price with coupon)).
Just check coupons out (with price alert and history). Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($9.99): BG31JAN2023A
2. ($12.21): BG589b2e
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BG67035b, BG06710c, BG7c8c97
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for Silicone Full Face Gas Mask Goggles. The lowest price was: $3.99.
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)).