Brand SOMAN, L 59-60cm, Material Carbon Fiber shell /EPS Lining, Using Crowd Man /Women /Unisex, Certification ECE Approved /DOT Certificated, Color 3 Fluorescent Green, Szie, XL 61-62cm, 2XL 63-63cm, Visor Double Lens/Dual Visor.
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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. ($199.99): BGcfebaf
2. ($269.16): BG589b2e
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGd02e68, BGdcbfa8, BG8ReviTrage, Cuponation9, 9OFFSUMMER, BGSCM75, BGd1725b
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for SOMAN 24K Carbon Fiber Fluorescent Motorcycle Helmet. The lowest price was: $189.99.
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)).