Right now the best price with coupon code for Portable Wearable Negative Ion Air Purifier is $9.5 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
Latest price update (UTC time):
Portable Wearable Negative Ion Air Purifier Neck Purifier 1.2 Billion Negative Ion Purifier Necklace Air Purifier with Digital Display – Black
Banggood ($9.50)
Banggood warehouse is located in China. But wait a sec… Is it a good price? This price is great, coz it’s the lowest in CouponsFromChina database! Well, there is one coupon available right now.
Link: Banggood product page
Price without coupon: $10.59
1. ($9.50): BG5883fe
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
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
Check out price history chart (for all/most countries) for Portable Wearable Negative Ion Air Purifier.
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)).