$8.99 – 2 Transmitters with 12V 4CH Channel Relay RF (Banggood, Aliexpress: Remote Distance: 30M, Receiver sensitivity: 105dB, Operating Voltage: DC 12V, Receiving frequency: 443.92MHz, Max load current: 20A, Frequency: 315mhz, Operating Current: 13 mAh (the best price with coupon)).
You can get 2 Transmitters with 12V 4CH Channel Relay RF for $8.99 using coupon code (in Banggood). Get coupons, create price alert or check price history out! Best price?
Latest coupon and price update (UTC):
Banggood ($8.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Well, is it a good price anyway? Good news! This is great price, coz it’s the lowest in CouponsFromChina database!
Link: Banggood product page
Price: $8.99
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BG1d6233, BG00c906, BG589b2e, BGET10
(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
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for 2 Transmitters with 12V 4CH Channel Relay RF? There we go. The lowest price was: $8.99.
Price records source(s): Banggood
Click on image to enlarge. 
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)).