Aliexpress
Click here… to search for SMSL SA-36A Pro Audio Amplifier Black on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment.
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): a194d9, 502C6B, e2bcea, 427168, elec, BGHU232, BGss506, AFfbG10, BGCITYADS2019, BGE13, 7d18f7, BGVDay10%off, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, BgoFErTaSchInA10, BGELIG0920, BgcLuBofErtA10, BGCuponation10, 13f142, BGHONEY2110, BGd0b05d
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for SMSL SA-36A Pro Audio Amplifier Black? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).