I have checked all old coupons and price is $152.71 for RadioMaster Boxer RC Transmitter CC2500 (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
RadioMaster Boxer Radio 2.4GHz Transmitter 4-in-1 Multi-Protocol/CC2500/ELRS Radio Remote Controller EDGETX Open System for FPV Racing Drone Quad RC Airplane Helicopter – CC2500
Latest coupon and price update (UTC):
Banggood ($152.71)
Banggood warehouse is located in China. Low/high price? Hmmm, price is higher than average (which is $129.61 right now), so better set price alert down below… We have found one coupon for this product!
Link: Banggood product page
Price without coupon: $165.99
1. ($152.71): BGALL8
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): BGRADIORU, BGToys8, JanBGCoupon8, BGSaleFeb8, BGSaleAD, BGMatt2022, BGMARCHSALE, BGToySale, BG589b2e, BGAUGUST8, BG78e178, BGCAPITALOS8, BGCOUPERT8, BG5a0adc, BGBFDAY8, BGNEWYEAR8, BGSSRC18, BGSPRING8OFF, BGHONEYSP, BGESJY8, BG15RC01
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – RadioMaster Boxer RC Transmitter 4 in 1 ($183.99)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for RadioMaster Boxer RC Transmitter CC2500 is here.
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)).