ATM you can buy 10pcs 5V Relay 1 Channel Module Expansion Board for $9.99 (in Banggood). Just check coupons out (with price alert and history). Best price?
5V relay module, 5V – 12V TTL control signal, Can be used for microcontroller development board module or home appliance control, Trigger mode: High level, Can control DC or AC signal / also 220V AC load, Power indicator, Normally open / closed contact
Latest coupon code price check (UTC time):
Banggood ($9.99)
Banggood warehouse is located in China. I have no active coupons for you right now. What about the price? There’s only 1 record in my database, so I have no idea if the price is OK.
Link: Banggood product page
Price: $9.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG9144b1, BG00c906, BG589b2e
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $8.99.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).