Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Working Voltage: 7-26v, Single Button Selection, Working frequency: 5.8G 64CH, Model: DIV006 V4(DVR), Channel: 64CH(RaceBand), Auto Scan, DVR Function: DVR with auto save function, Antenna Connector: SMA- Jack (outer thread, Format: NTSC/PAL selectable via menu, 210mA, Power Consumption: 12V, Diversity, Channel Selection: Digital Display, inner hole), Sensitivity: ≥-95db
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($45.96): bGhOnEy10
2. ($46.07): 7d18f7
3. ($46.98): Parts8
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGDIV006, f62884, BGss506, bgssaff9, BGPAYPALSS, BGBCFPV, BGBCBG10, 502C6B, BGOTC21, BGBFAFF2019, BGCITYADS2019, 2020CNY
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Aomway DIV006 V4 FPV Receiver.
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)).