I have just checked coupons. The lowest price I could get is 9.99 USD for Electromagnetic DIY Electronic Kit Coil Booster Circuit Board (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
Latest coupon code price check (UTC time):
Banggood (9.99 USD)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. You probably want to know if this is a good price. This price is great, coz it’s the lowest in CouponsFromChina database!
Link: Banggood product page
Price: 9.99 USD
9.99 USD – This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Aliexpress
Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for Electromagnetic DIY Electronic Kit Coil Booster Circuit Board? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).