Go down and check coupons out. Remember to check price history if it is available. What is the best price?
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):
By using advanced algorithms it takes the best signal from each antenna and blends them into the clearest FPV picture possible.
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. ($157.17): BGAFF7OFF
2. ($157.17): BG11PP12
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): acc63b, cc0923, 502C6B, c3da4e, f62884, plgoo2, esImmersion, esImmersion01, esImmersion02, BGVLOGIMMER, BGesImmersion03, BGesImmersion04, aff7off, BGRapidFIRE, BGImmer01, BGImmerRC, BGIMM8, BGIMMER, BGIRC10, BGRPC15, BGss9%rc, bgssaff9, BGImmersionRCes, BGBCFPV, BGImmersionRC15, BGBCEIMMER, BGMM15, BGBCBG10, BGANCB2, BGANCB3, BGCNA10, bgchinafest, BGOCT4, BGOTC21, BGDDEE11, BG11PT125, BGDE1110, BGBFAFF2019, BGJPBF16, BGCITYADS2019, BGBMRC4, BGBFEvent5, BGEER, BGImmersionRCES10, bGpAnDacHeCk, BGNYIRC10, BGRapidF, 2020CNY, bGhOnEy10, BGGDG, BGSPBP10, SKU900291, BGDSHJK, BGJOUIO, bgshOOp10, BGSTDGH, BGJPEV9072, BGTHSEP019, BGJPRC1001, BGTT10, BGBLACK125, BGFPV-10, BGrandy21, BGESIMRC, BGCuponation10, BGRU, xollodrnes24, BGFPV10, BGcd3c41, 00c906, BG00c906, BGHU1527, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGRCT10, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BgGoodie9
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Hong Kong – ImmersionRC RapidFIRE Analog Plus FPV Receiver Module ($-3)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $129.
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)).