Just check coupons out (with price alert and history). Best price?
Max. Transmission Distance: FCC/SRRC: 4km, Operating Temperature Range: 32° to 104° F (0℃ ~40℃), CE: <14dBm, 3-in-1 Port, F4, Item Name: Vista Kit, I/O Interface: USB-C, High Quality Mode(720p 60fps): 30-40ms, Input Power: 7.4-26.4V, CE: 0.7km, IPEX, Transmitter Power(EIRP): FCC/SRRC/MIC: <30dBm, Supported Flight Control System: F3, microSD card slot, Operating Frequency: 5.725-5.850GHz, Min. Latency (end-to-end): Low Latency Mode(720p 120fps): 21-28ms, F7
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
1. ($141.72): 8BGwbg2204
2. ($144.04): BGFPV10
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG9NY, Parts8, 2020CNY, BGBRCTD8, BGVDay10%off, BGOTC21, BGCVHD, bGhOnEy10, BGCAVSA, BGCADVSA10, BGVISTA10, BGSPBP09, BGCDL135, BGTT10, bgshOOp10, BGSEVIP02, BGTHSEP09, BGRC902, BGChollodronesCaddx, BGHALLOWEEN, BGESCVHDC, BGBLACK127, BGTANGH1, BG11PP12, BGAFF7OFF, BGVistahd, BGYD31, BGFPV-10, BGESCVHD, BGCuponation10, ADMITAD2212, 2022ACTIESNL
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Caddx Vista HD RC Digital System ($-3)
Price history and price alert
Price history is not available for this item (not enough database records)! The lowest price was $141.72 though.
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)).