Aliexpress
Click here… to search for RGBDuino UN0 V1.1 Geek Duck Development Board on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (15.03 USD): BG00c906
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9, TTSUMMER8, Cuponation9
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for RGBDuino UN0 V1.1 Geek Duck Development Board is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).