Weight: 1.4g, Power: PIT/25/100/200/ MAX 350 mW, Connector: UFL, Protocol: TBS Smart Audio, Channels: 48, Input Volt: 5V.
Check coupons or create price alert down below. 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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($19.16): C5B07F
apply code in your basket (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): 0e7f33, FBCOUPON1, BGRush12
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for Rush Tiny Tank Mini Audio FPV Transmitter? There we go. The lowest price was: $17.99.
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)).