Aliexpress
Click here… to search for RGBDuino UN0 V1.2 Jenny Development Board ATmega328P on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): Tabby20, 2203ActiesNL, BG1efeb0, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9, TTSUMMER8, Cuponation9, BG00c906, BG589b2e
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for RGBDuino UN0 V1.2 Jenny Development Board ATmega328P.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).