12V Input Current: 40mA@Pitmode / 95mA@25mW / 185mA@200mW / 250mA@500mW / 380mA@800mW, Channels: 48CH RaceBand / LowRace, Audio: Support audio input, Power: PIT/25/200/500/800 mW, Output Voltage: 5V 1A, Weight: 6.8g(including cable), Dimensions: 36*36*4.5 mm, Item Name: Rush Tank II, Input Voltage: 7-36V DC.
You can create price alert here, copy coupons and view price history. Best price?
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 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. ($34.03): BGMatt2022
2. ($34.03): BGToys8
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): bGhOnEy10, bgshOOp10, BGTT10, BGBLACKF299, Parts8, BGDAVIS, xollodrnes59, 13f142, Cholldrons36, BGJON8, BGRCParts8, ADMITAD2212, BG1efeb0, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, hoNEYbGdeAlS, BGRCT10, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BGGutscheine, BG8OFFCOUPON, TTBLACK5, BG589b2e
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – RUSH TANK II V2 Ultimate 2-8S VTX FPV Transmitter ($-3)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $28.9.
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)).