Input voltage: 7-36V DC, Weight: 5.5g, Lipo battery: 2-8S, Output voltage: 5V 1A.
Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
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.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($36.77): Cuponation9
2. ($37.18): BGJON8
3. ($37.18): BGRCParts8
4. ($37.18): BG8ReviTrage
just apply this code 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/i1u
Old coupons (from the oldest to the newest): RTRV, 502C6B, bgssaff9, affbg10, BGRUSH, AFfbG10, BGTR17, BGWKVTX, BGDPRUSH, 0e7f33, FBCOUPON1, BGRUVTX12, BGAFF10OFF, BGCuponation10, BGHONEY2110, BGDAVIS, Parts8, BGGAL8, Tabby20, BG1efeb0, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGRCT10, BGJUNEGSG9
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for RUSH Tank Racing VTX 5.8G RC Audio Video Transmitter is here. The lowest price was: $15.99.
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)).