Frequency 5.725-5.850 GHz, Model DJI AIR UNIT, Dimensions 44*37.8*14.4 mm, Power 7.4-17.6 V@ 4-9W, Max. Distance FCC/SRRC: <4 km, Net Weight 33g. Go down and check coupons out. Remember to check price history if it is available. What is 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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($161.91): BGToys8
coupon code has to be applied in shop’s 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): BG8OFFCOUPON, TTBLACK5
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for RunCam Wasp DJI Air Unit. The lowest price was: $161.91.
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)).