Aliexpress
Click here… to search for K500 104 Keys Wired Keyboard on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now…
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!
Old coupons (from the oldest to the newest): BG975636, BG589b2e
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for K500 104 Keys Wired Keyboard is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).